Faced with spending even more money with Zacuto, while I re-invent the wheel, I didn't like any of the hand held rig options - they seemed a bit klunky. I'm not a young guy, so I've got old stuff around.
I found that my Peter Liesand body brace for an Arri 16BL works great for my 7D set-up. I love mixing old with new.
Yeah the Zacuto stuff is top-notch but ouch - spendy! Red Rock Micro has great quality rigs for half of what Zacuto charges. We went even cheaper with Indifocus and have been pretty happy with the rigs - more weight than Zacuto or RedRock but similar features for a lot less cash...
I second the Indifocus stuff. Inexpensive, but pretty nice to work with. I went that route and don't regret it. If I had a bigger budget I would go with something a bit more accurate and flexible, but for now the Indifocus UltraCompact does the job.
I've yet to find a good DIY source for building rails. I am a big fan of DIY equipment - I've built lights, dollies, rigs, stabilizers, etc. For me, it's fun making something you can use. If I could afford the spendier stuff, I would get them. I picked up the Killer Camera Rigs That You Can Build book and have built a couple rigs, too.
I guess I just need to know if there is a standard size/configuration for rails...?