I dont know of an actual care sheet that is available for them. I would think its similar to the rest of the Kinyongia chams, however i know that some are a little more sensitive the supplements. I was going to work with these and did quite a bit of research, and never ended up getting them. That was 3 or 4 years ago though.
I kept my K. Multi's at a basking temp of 80-82, with an ambient of 70, and down to 60 ish at night. They are from the high mountains tops and prefer cooler conditions. From my knowledge, Boehmei are a bit smaller, so a 18x36 would be plenty i imagine. However, Kinyongia are a very active species and roam a lot.
I gave calcium W/O D3 twice a week, D3 and Multi Vitamin every 6 weeks. Here is a good thread about it supplements.