very nice, Pat. i built a DIY tower for my old MC PS190 that i can't find a pic of. it was fairly ugly, but very functional.
my current one isn't homemade, but i designed it. i had it built by Skyjac when i used to rep them in '01. it folds almost exactly the same way as yours, except mine splits below the ladder bar in the back legs. i did make the bimini mounts, and modded the bimini a little bit to fit. that's a standard Sunbrella bimini that was like $300. it's 6' long, so it covers almost all the way over the back seat.