Whether you build or buy your workbench, it must be designed and constructed to withstand the rigors and pounding you’ll put it through. The base and legs should be sturdy and the table should not easily be knocked over. The top should be durable and not easily dinged or dented. Make sure your workbench is made of a material appropriate for your types of projects, too.
We don't have a Dometic CFX-50 in our van, but we wish we had gotten one for our build. This is a great little fridge that many vanlifers happily own. It’s rugged and durable, and it keeps your food cold for less money than many of the other fridges out there. It also has a nifty side-open lid, which makes it a lot easier to open with a lower clearance.
The refrigeration setup in your van is an area where you really do get what you pay for, whether you’re paying in money or in time. The best options are the most expensive. The cheapest options are a pain and/or don’t work very well. And if you try to save money with a DIY refrigerator setup, you could end up spending a lot of time on installation.