Yes! Snowbird all the way. You do bring up a big plus that I knew about but had no way of knowing just how much space I could save. Thank you for the cabinet example example, big plus to no insulation!
Yes I haven't seen/heard anyone talk about this aspect...the amount of space saved by not using insulation, and in particular how it could factor in as cabinet space. This photo shows one part of my van conversion...photo one shows a lower panel I am about to install, where I created two cabinets that use only the space inside the van wall. So the cabinet doors are flush to the surface of the van interior, and the 4 inch deep space inside is sufficient for many items...I use one of these cabinets to store 2 wine bottles.
The second photo shows my bed on the passenger side of the cargo area, and the 2 large "medicine cabinet" cabinets on that wall. These also use ONLY the space INSIDE the van wall, so the cabinet doors are flush with the van interior surface (the 1/4 plywood mounted on the van surface) and these cabinets store a LOT of things. Yes they are small items, no more than 4 inch depth, but we do carry a lot of small things with us. Eg shampoo bottles, toiletries, first aid kit, flashlights, batteries, even cans of food all fit in here.
Note this is not the final van conversion shown...I did more work and installed cabinets/shelving in the back of the van behind the bed, as there is a good 11 inches of space back there to be used. And as I did this I realized that it was a good thing I hadn't gotten a van with rear windows, as I'd have been reluctant to cover those up with cabinets and shelves. But the back cabinets are important storage space for me and I'd have lost those if I thought I needed to preserve the space just to be able to look out the back windows. Check out a lot of van build videos and in most cases I think you'll see that people who have rear windows, end up covering them up most of the time, with removable covers if nothing else. Rear windows are not as practical IMO as a good side door window.