The tablesaw—This tool is the backbone of nearly every shop, and for good reason. It allows unmatched precision in ripping parallel edges and crosscutting at a variety of angles. Most woodworkers find it crucial for the basic milling of stock. It is also suited to many joinery tasks, easily producing tenons, box joints, and—with a reground blade—the tails for dovetail joints.
I would definitely stick with the vapor barrier under the floor to avoid moisture from breaking up the OSB. try to build the base high enough to keep it dry and allow airflow to dry it out under there. FYI I recently repaired a neighbor's shed roof that must have been partially repaired before with plywood. The OSB was fine under the shingles, but the plywood was wrecked due to moisture. I would stick with OSB. Since you live here in NOVA, details will be a little more helpful to you. I really can't use the shed in the summer without the AC on. It gets direct sun and gets up to the 90's in there with out any air movement. I am planning on eventually lining the inside of the ceiling with that thin reflective insulation to bounce back some of the heat.
People tend to buy cargo vans for work and hold on to them for years, so many vans on the market can be pretty beat up. Although you can find inexpensive cargo vans in good condition, it can be tough to find anything with lower mileage - so be prepared for all that comes with owning a higher mileage vehicle. Cargo vans also don’t offer much headroom. There’s no way even shorter people will be able to stand in one, and the lack of headroom also cuts down on storage space.
You can also make your store comfortable by incorporating a waiting area with comfy seats and benches to encourage customers to spend more time in your store. This is especially helpful for shoppers accompanied by someone who isn't interested in making a purchase. But keep the seats or benches facing the merchandise so that they're still top of mind for those lounging around in your store.  
Without organization, living in a van can feel cluttered and chaotic, so you'll want to make the most of your storage space. This is a good time to make sure you've paired down your belongings to a reasonable amount and to make sure everything has a place. (As a former engineer who loves making things as efficient and optimized as possible, this was Ben's favorite step!) 
In today’s competitive business landscape, the key card that small business owners hold up their sleeve is their ability to offer something distinctive, original, and personal. As small businesses grow, however, it can become increasingly difficult for the time-pressed, financially strapped entrepreneur to maintain direct oversight over every aspect of their store.
Tip: Save money on specialty displays! Many manufacturers offer retailers low-cost or free specialty display fixtures designed to highlight their branded lines, like the one pictured below. These make great speed bump or outpost display units on a tight budget. Your product line reps can tell you if they’re available, plus provide merchandising and display advice.
The number of windows, as well as their sizing and placement, depends on your orientation, view, desire for ventilation, and needs for daylight and solar gain. Orienting more of your windows towards the south side of your shop and placing them high enough that they are shaded by the eaves in summer, but allow lower-angle winter light to come in, will increase your ability to get free light and heat from the sun. If your goal is to take advantage of passive solar opportunities, make sure that you carefully research the type of glass that is in your windows and look for something with a high solar heat gain coefficient. Higher windows generally allow for benches and tools beneath them, and relatively win­dowless north walls may be a place to arrange wood storage or mechanicals.

A lot has changed in recent years. Sophisticated, yet affordable technology now exists that can help track customer relationships from an ad placed on Google, right through to a successful sale. This offers small business owners a unique chance to be entirely data-driven in their marketing approach. Every single aspect of your small business can be tweaked and optimized to ensure that you are enticing customers, up selling where possible, and encouraging people to spread the word about your business.
The router—The router is the master when it comes to flexibility. Its potential far exceeds trimming and decorative edge treatments. A router will cut mortises, rabbets, and dadoes, and adding a router table builds in even more versatility, including biscuit joinery and raised-panel doors. But where the router distinguishes itself from all other tools is in its ability to produce identical parts using a pattern.
However, my guess is around $250,00 t0 $300,000. So as you say you will have a good mortgage to pay for. So excuse me for being nosy. I am retired and I have started setting up my shop in my two car garage. It is not insulated just bare walls and open ceiling. I am going to start doing some projects and will keep watching your shows. I was a Computer Engineer and although I liked my job i always had that desire to get back in wood working and now I am doing just that.

We think that insulating your van’s floor is worth the minimal extra cost it adds to your build. The best floor insulation is ½” XPS foam board due to its high r-value per inch and its compressive strength. But a layer of Reflectix will add some insulation while taking away less headspace. We used Reflectix, but if we did it again we’d go with the foam board.
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