6" folded refractor

Can anyone point me to a resource for building a folded refractor? I have a 6" f/12 (originally from a 1985 AP Superplanetary) that I would like to put in a more compact tube. I need help on everything - secondary and tertiary mirror sizes and placement, mirror cells, collimation, etc. Any advice is appreciated.
Another option (and perhaps this doesn't belong in the TM forum) would be to contract out the tube assembly, less the objective. If anyone knows anybody that does this type of work, please let me know.

You might want to send a quick email to Dave Trott (http://members.aol.com/_ht_a/davetrott/page1.htm), he has a very nice 5" folded refractor that he built (see his website). He might be able to give you some pointers on where/how to progress in your building.

Eric