[jhautz]

The case looks solid. I like it. I'd pay for it. Just make sure the stock pastic covers and all work on it. I want one thats anodized in black!

I really like the idea of having a spot on the end that will screw to the empty motor mount position like the RCM heatsink. I also agree that it could use more mass on the bottom.
Make sure you mill a few slots in the extra mass on the bottom to allow it to help it disipate heat to the air and a couple screw holes for mounting a fan too it also. I would make that plate that goes in between the boards out of copper to get the absolute best heat transmision possible. Also make sure you get a really good thermal compound on the ends of that plate where it attaches to the main case body.

How are you planning to attach the fets to the case and the middle plate? What keeps them in solid contact?