The floor-size sure sounds right for a Burm. I personally prefer enclosures with more headroom, but 18" is pretty much "industry standard" from everything that I've read and seen. Long, low cages remind me of coffins, so I prefer 36" or higher, even if it does just waste heat.
Be sure to post a review when you get the enclosure -- I was considering Cages By Design but dilly-dallied too long and didn't get the order in before they jacked up their prices. I'd love to know what their build-quality is like, as well as the overall stability of their aluminum-framed plastic panel design.
As far as price goes, $560 sounds like a good deal for the square-footage.
"Heat panel" -- infrared radiating, bychance? Any more details?
--jr