Thanks, guys. You're very kind.
And yes James, you can do this stuff. I've had no training in DIY, except for watching some of the shows on TV. So if I can do it, you can.
Edit: I neglected to mention that I also read some DIY magazines and books.
BeerParty--You got it.
There are recessed lights in the 4 corner medallions.
The beams are hollow (I used 1/4" plywood). Two of them carry the heating and cooling air (1 intake and 1 output), each with multiple vents which face a wall and blend in pretty well.
Sorry about the off-topic stuff, folks. I'll be back on the Howitzer build real soon.