Hi wolfman, I'm pretty sure that Sonoran Desert Boa doesn't exceed 6 feet, or even 5'5". If you PM me we can talk further, and I can give you contact info for a few people who I know have these. Unfortunately though, these are not BCC's, they are BCI's... Here's a picture I found off of the "cutting edge herp" website:

I'll think of more, but as far as I know, BCC's get BIG, and there's no way around it; but I could be wrong. :?

Good luck!
Jennifer