I bought Oz's '95 Quigley box ambo with the intention of doing a 2nd build. I went back to work full time & it just sits. Thinking of selling it or my 1st build & slowly building the other over the next 5 years until I retire again. I also have an Alpenlite truck camper which has everything you'd need , including a wetbath & genset. Have thoughts of using the entire cabover/roof assembly, which would give me about an extra 10" headroom. A lot of work but it measures out perfectly.
My '97 would be way out of your budget.
Also of note, my '97 Quigley has the Agile Offroad Ride Improvement Package. drives like a DREAM on & offroad. Rig has been to Alaska & all over the country, has never failed to go where I've asked, but I understand limitations. Ironically , when I was at Expo East last fall, I had a U-joint go out. U-Joint was right down the street! They got my (shhhh) Quigley back to me in 1/2 day including sending the driveshaft out for balancing. A great group of guys, thanks Chris. If I had a 2wd I wanted to convert I'd go with them, but I'd take my Quigley as it sits over anything out there...