I have to confess to going the quick/cheap route myself. The dimensions of the 990 make it somewhat difficult to find a suitable rack. It's very deep, especially when you account for room behind it for cabling. I ended up going to Home Depot and buying industrial steel shelves. The frame is stamped steel with adjustable height shelves and the shelves themselves are made out of MDF. I'm not sure how I can include the photo here so if anyone is interested to see what it looks like, shoot me an email and I'll email you a jpeg.

Cheers,