Hi Ryan: Nice job on the truck. I also have ’94 Toya 4×4 coffin sleep setup. Looking to change (access cab wanted) and may use some of your ideas. One thing I didn’t see you mention is ventilation. I am from the Mid-Atlantic region(DC/Maryland, you’re old stomping grounds) and ventilation at the New is important. My side windows have screens and I use an old mesh fly with a flexible pole for the rear tailgate area. It works really well. Kinda jerry rigged but is easy to put up and take down as well as pass through for nighttime truck exits. Not needed out west as much since bugs and humidity are lower but can’t live w/out it in these parts.

The cheapest and easiest way to supply fresh water to your sink is with refillable plastic water containers. There are many styles available, including jerry-can style containers, the extremely common Aqua-Tainer, or standard 5-gallon water cooler jugs. Which one you go with really depends on personal preference and the dimensions of your kitchen cabinets.

As far as the batten, your actual question..haha. There has not been any moisture or rain make its way through. However, I did caulk all of those joints before I painted. I also made sure I primed all the exposed edges, especially the bottoms of the osb sheeting. You could probably put some pvc j channel along the bottom to prevent rain splash from absorbing up into the end grain. Just make sure you give a way to drain any water that makes it in the j channel. Does that make sense?
Make sure to run ground wires wrapped around all lengths of flexible exhaust hose to prevent static build up, which can spark and potentially ignite. I chose the King 1.5 HP dust collector, with a 115 volt motor, so I did not need special wir­ing for it. A shop vac is a must, as well, used to vacuum out machinery, and to remove dust from furniture prior to fin­ishing. Finally, an air filtration system was installed to clear the air of tiny airborne particles. The King KAC 650 unit I installed does a nice job, has a remote control, and a program­mable delay – I usually have the air cleaner run for a timed two hours when I leave the shop.