Just stumbled across this thread...

I have been thinking about a heated enclosure for a while, and I think the biggest challenge you will have is actually overheating the extruder motor so it softens the extruder plastic and droops. I have found that the motor needs a fan in ambient room temperatures, and I expect keeping it cool will be a challenge in a heated enclosure.

I also didn't see anyone else mention that you may not want the sloped front. Keep in mind that you'll be building parts on the bed, and anything tall at the front of the bed may hit the door.

I'm very interested to see how this works out. I'd love to be able to use the whole 8x8 glass for a long build without warping.