Hi there
I keep two brazilians, one is aproximately 16 months old and the other 4 months old. It is my understanding that the females generally grow larger than themales, usually reaching up to about 7ft, the males nearer 6 ft, but they can grow larger. A friend of mine has 4 adults all of which are within the 6 - 7ft range.
I would be perfectly willling to share my experiences with you if you wish to contact me. Both of mine are pretty friendly towards me but one of them can be aggressive towards my husband.
I would say that with this breed it is particularly important to get their humidity level correct and Ive found that using a mix of coco fibre and orchid bark helps to retain the humidity in the viv. I try to maintain humidity at 60 - 70 %, raising it more when a shed is imminent. They seem to enjoy burrowing in the coc bark aswell. I also keep a damp sphagnum moss hide within the vivs, which does get used. For heating I use ceramics, I know it dries the air, but it works for our vivs as long as I mist once daily. Dont let their temps get above 85 as this can be dangerous to them.
I also place an extra water bowl below the ceramics to aid with humidity.
I would say that they mildly more tempermental than corns, but Ive found them quite easy to handle, and mine only get handled a couple of times weekly.
Heres one site Ive used, I will have a look for the others, but mainly Ive relied on the experience of others I talk to on the net and people who go to our reptile group meetings.
http://www.rainbowboa.co.uk/care.php
A qucik search revealed:-
http://www.corallus.com/cenchria/
http://coloherp.org/careshts/snakes/rain-boa.php
http://www.vpi.com/5vpibreeders/BrazilianRainbowBoa/BrazilianRainbowBoa.htm
Best of luck with youre boas, they such beautiful snakes, I hope you enjoy them.