Many of the mounts available through Celestron and other more custom mounts ran anywhere from $450 - 1200 including shipping.
After a while, i just thought I'd be better off purchasing $300-400 worth of good metal tools and build it myself. I spent a good deal of time using Sketch-up to build a base design - used many examples of previous designs I'd seen on the net.
Over the last 3 weeks I purchased a Hor/Ver Metal Band Saw, 10" Disk Sander, Small Grinder, and a Bench Press, various clamps bits, taps/die set, transfer punch, etc- I now have a basic home metal shop for about the price of a low-end wedge!
I got about 70lbs of misc Aluminum bar and plate at Aaron Scrap metals in Hayward for about $1/lb. the result is great - haven't been able to test completely (it was cloudy last night), but its solid on a 12" cement pier. Virtually no detectable movement unless I slam into the pier. If anyone wants copies of the plans I'll post on sugarsync later today/tomorrow (let me know) - you can download sketch-up for free (don't need to purchase pro version). Enjoy...