Kris is an EXCELLENT guy to work with, and an outstanding member in the retic community. He keeps detailed traces of his SD / D lines which help future keepers and breeders trace the amount of bloods in their own outcrosses later. Kris will answer your questions quick, and work with you whenever he can.
I responded to this question in PM - I'll post it here so others can see
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Yeah, I've housed a 10' male comfortably in a 4x2x2 without any issues. The larger space males have, the more aggressive they seem to become during the breeding season (territory related). The problem with Dwarf retics, is the locales which are most commonly used (Jampea) still may and can reach max lengths around 16' for females, and 12-14' for males (records). On average, the female pures get 12' and the males around 8-9'. Having said that . . . My Goldenchild male is about to turn 2 years old. Was fed very appropriately and large items. He is housed in a Vision 400 with plenty of room, and is around 8' ready to breed. He is only 50% Jampea. In theory, the more blood you get, the smaller they can become.
So while 6-9' is definitely not inconceivable, there is still a chance that the snake could get above 10' even at that dwarf level since the pures can max out much larger and you're simply adding in mainland blood during the crosses.
Feed heavy (every 4-7 days) for the first 6 months in my opinion, then back off to every 7-10 days, then back off to every 10-14 days an appropriate sized item when it starts adding to girth and not length (usually around 18 months). Where they are at this point, should stable out, and add no more than a foot in their lifetime, pending that you maintain this schedule.
Any more questions, just ask.