I would LOVE a Boaphile for my boa. I am looking at the 421D model with a lock added (for my son's safety, last thing I need is my ex husband telling people I keep a large snake in the house unsecured )

Now, I contacted Boaphile via the email address provided on the website about 2 weeks ago, and from other posts I've heard they kinda suck at getting back to people about questions but I still really want one so maybe it's worth the wait. Is this size good enough for a male BCI boa? Now, eventually I will need one for my female boa, should I look into the 6421D 6' cage for a female? I'd assume they'd need more space than a 4' cage. However, they do make 5' cages too.

Also, I only use flexwatt and UTHs. I have zero experience with radiant heat panels. How exactly do they work? Do they work inside the enclosure like a UTH but made for being inside the cage? Is it for belly heat? Back heat? I don't know, any info on RHPs would help a lot. Include whether or not a thermostat is needed and how they are hooked up