Pretty sure I'll be exploring kits. I've seen some that look pretty good. The stuff is a good combo of lightweight and attaractive. I can fantacize about lightweight shelves, cabinets, etc. - largely aluminum frame fiberglass face with wood veneer over, but making that stuff would be something to hold off on. Who knows, if I take off with it I could explore it but got to walk before I can run.
I've been looking for used units locally, there's a commercial truck rental place near Palo Alto that also does sales, they have two Freightliner 144" wb models with 2.1 turbo diesels.
I didn't realize that Freightliner was just a rebadged Mercedes, not sure what's up with that. Seems the Mercedes star would add some cachet, I would rather go that route.
https://www.htrucks.com/sales_cargovans_detail.php?ID=15052
These 2 units are almost identical, 66k miles $36,000. This place has a really good reputation for used vehicles. Everything that matters has been checked out and/or renewed. These are refrigerated, no big, that comes out, could probably sell it, would need to remove the sepearator. I'll keep looking. Not sure how well the 2.1 diesel does. I guess the smaller motor comes with a 9 speed tranny. Would rather go with the 3.0 I think.
Here's one kit that looks pretty good:
https://www.curbed.com/2018/6/8/17427036/camper-van-for-sale-vanlife-diy-kit
This link has a lot of photos on one page from a manufacturer - not a kit - good food for thought:
https://www.businessinsider.com/vansmith-new-camper-van-mercedes-benz-sprinter-2020-5#theres-also-a-garage-space-underneath-the-bed-to-store-larger-belongings-such-as-gear-and-equipment-8