Ok folks, first off I will admit I'm a complete boa newb. So, here's the question...
I just came across a BRB on CL for $50. She is supposedly ~4 years old, and over 5ft
She is freaking gorgeous...

So! I know they need a gradient of around 75-83, hides, HUMIDITY (Florida, yay, no problem here) etc.
My question is this-
Would she be alright in a 41qt tub, with a heat mat on thermostat either belly or side (whichever is best for her, please advise)
cypress mulch, sphagnum moss hides etc until we can get her a nice 4x2x2 pvc cage? This could be a month, it could be 2-3 months, it just depends on finances. The thing is, I don't want her suffering or cramped, or have her health decline. So if this isn't a decent few month option, I'll keep wracking my brain to figure out one.

Any input is welcomed, warnings, etc. She's so beautiful...I truly hope I can make this work somehow.