Do you guys have a link to any pics of your F5x build?
What is this new pass amp you're referring to?
I agree that beveling the edges a bit like the BHSE is a nice look. In the case design that we were playing around with last year, we did something very similar. I was looking at digger's case too n3rdling, and I was awfully tempted. In the end, I already have a bunch of the parts and I wanted to try making a custom case. As sweet as KG's case is, those sinks cook and I'd like to have the amp run a bit cooler for long term reliability. If it were me, I would either anodize or powder coat the case. I know some of the HC guys are super minimalists, but I like my gear to have a bit more "flare" than that. 
Oh what the hell, for some reason I coulda sworn the faceplate on the BHSE had about 2" cut from each side which is the look I'm referring to (not just beveled). I know there are commerical amps that do this, I just can't remember which ones off the top of my head. It shows off the design of the heatsinks from the front.
