I've given this much thought whilst building my Funk.
When I proposed a spec I got constructive coments on componants not being 1992 or too late.
This set me thinking. If I had bought my Funk back in 1992 i would have probably used it for 5-6 years before buying something new. Now, as things broke or wore out they would have been replaced. As previously mentioned, taste and fashion would have also had me scurrying to my LBS to buy new parts. I doubt that I would have tracked down a NOS 4 year old XTR rear mech if it got t***ed against a rock- the latest bit of kit would have taken its place. Therefore by the time i sold/threw it in the shed it would have been a much different animal to the one bought several years previously.
I had this in mind when buying the bits for the Funk and have a spread of 1992 to 1995, which IMHO is perfectly acceptable for a 92 bike.
Now then, does this time spread work in reverse?? Would it be OK to build, lets say a 1995 frame up with 1990-93 parts??
What I'm trying to say is that IMHO I think a build should be sympathetic to the era without rigidly sticking to a frozen point in time.
Just my 2 pennarth
Retro in spirit.