Yeah, it's my dream. It's the only sure way to beat rust. Unfortunately the prices keep going up. If more of us would buy them I'm sure the price would eventually come down.
My idea was to use the 81-91 flip forward front clip with a 89-91 grill, a 73+ tub and a full soft-top, maybe using a 73+ stock fiberglass top sometimes, too. I have contacted them a couple of times and they are always kind of rude (or just really bad at email, at least) but it sounds like this is possible. Then tie a roll cage to the frame.
Body mounts would be easier using the 80+ tub and cutting it to make a full-topper (rear legroom improvement, too), but I don't know if the remaining windsheild portion would be strong enough. I assume that you have to cut the doors off, either way.
For some reason, they don't offer a tailgate. This is a bummer since tailgates like to rust. I asked them if the Blazer tubs will accept a truck tailgate and they told me that the two were "completely different". I don't know what they mean by that.
While we are discussing fiberglass bodies, it seems to me you would have a ton of additional ground wires to run.