Even if you do all the work yourself, you can't just discount that time as free. You need to give that time a dollar amount to add to the cost of the restoration in case you have to sell.
Say you put 1000hrs into a car, over 3 years. You could have spent a little more in the beginning and bought a better car that you would have been driving those 3 years, and put that 1000hrs of work into your house and yard that will actually add value.
There's plenty of rust free vans around. You just need to be willing to spend the extra $5k at the beginning to save yourself $15k in the end.
Reading the description you've got windows, sunroof, quarters, sill and beaver panel. That's most of the car and just what you can see. There could be more elsewhere. If you're doing it purely for the love of it and have those rust repair skills then go for it, but my general rule is "if you have to ask, then you're not set up to do it". Some will persist but most of these projects end up as an incomplete money pit on eBay in the end.
Edit- after re-reading the post here's what I'd do.
Sell the rusty Sandman. Put that money toward giving the WB a quick coat of paint to make it presentable and then put your driveline in it and drive it. It'll owe you bugger all. In the meantime keep an eye out for a Sandman with a good windowless shell. Keep saving your money and eventually you'll find one that's either had the panel work done or doesn't need much. Then you can either sell the WB as a complete car and put that money into the Sandman or swap your running gear over and sell the WB as a roller.
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