I have one I've been collecting parts for that I'm probably finally going to start assembly this next year.
It's a 1970 International Loadstar crewcab, Airforce rig. It's going on an 07 International 4300 frame with Axletech 4000 axles and a T600 transfercase. It will be rolling on 395/85/20 Michelin XZLs and powered by a Cummins 8.3 and Allison MT654CR from a M 9XX 5 ton. The "camper" will probably be an old US Forest Service crew buggy body that I picked up cheap and came out of Six Rivers National Forest about 20 miles or so from where I grew up.
I have all the big parts and just need to do some assembly. And it does seem like rigs like Casa Azul that are built and not bought seem to be getting fewer and fewer. My grandfather built a "motorhome" back in the early 70s to survive the Alaskan Highway because he got tired of breaking down on his trips there and back, he started driving up in mid 60s every year for gold mining. He took a 1970 Ford cabover with a CAT 1145, 5 speed and two speed rearend. Proceeded to extend the frame and lighten the rear springs. He then got a brand new 1972 Winnebago 27' fifth wheel, jacked it up, removed the axles and backed the Ford under it. So it was double framed and it was attached at the front with the fifth wheel hitch. He built sides and a front that matched the color and design of the trailer to enclose the front fifth wheel portion and used it as storage. He could unbolt the sides to put big items in, one year he had the finals and doglegs for a D8 in there, he said that was smoothest ride up ever. He had 4 tanks could make it from Phoenix AZ to almost Fairbanks AK without refueling.
His rig inspired me from a very young age and then I saw Casa Azul on a TV show probably 20 years ago and I decided to build my own. I've been collecting parts for just over 10 years now for my build and now it's time to start.