I mounted the seat to a Trek System 2 seatpost that I polished.
I've also fitted the BB, polished and fitted the Suntour XC Expert crankset and added the XC Pro GG pedals, Tioga Alchemy Headset, Pace RC35 Forks, and System 2 Bar and Stem.
I modified the 8 speed Suntour MD cassette by removing one cog so that it fits on my 7 Speed hub.
I had a go at trying to fit the XC Pro self-energising brakes but soon realised I will actually have to read the instructions if I'm going to get them to work properly.
I have bought and am now awaiting arrival of a NOS Suntour XC Pro MD rear derailleur, as my plan to restore the one I have, got the better of me.
I have also bodged together a seatpost clamp using a Suntour quick release bolt, an unknown alloy clamp, some washers and a Dia Compe cable hanger - having mailed loads of sellers of Trek frames and put up a Wanted ad here and thus far having no luck, I am yet to find the elusive correct Trek clamp so this will have to do for now... the hunt goes on.