Related:
- https://bitcointalksearch.org/topic/guide-make-your-own-open-frame-rig-29729
- http://www.bitcoinminer.com/post/23625498251
The DIY would obv be cheaper, but Chomiczewski's are much more expensive.
I have one of the Chomiczewski frames, but modified to fit my needs.
I can tell you that though they are little on the pricey side, they are well worth it. Clean Cuts, plenty of parts and even send you the tools that you need to put it all together. I did price out to make it myself, and the metal would cost about the same by the time you added in shipping.
Overall, very impressed with his product.