Thanks for the offer but I'll probably tinker around a bit more before I build my prototype.
I found a Ramsey "mini-kit" at fry's for building a simple vox circuit that I'm going to muck around with to see if it will serve.
BTW: The parts can all be had from www.digikey.com.
There is nothing special on the parts list other than the op-amps and the opto-relays and the part numbers came from the digikey catalog.