I do a lot of conversions at our shop (a co-op) and I have a few simple rules.

Classic frames need to stay classic and you will rock a front brake...if you don't like this you can go somewhere else.

With this being said, there are times when I can barely keep up with the work that comes in the door and get calls from all over the place from people looking for build advice... we also have a fixed gear culture here that seems to embrace the ideas of preservation of the bike and preservation of the body.

Next week I am going to be building up a one of a kind hand built Proctor for a fellow here who respects the fact his bike is a collector's item and won't be doing anything to impair the integrity of the bike when he turns it into a fixed gear commuter.

I ride three conversions and aside from my folder, have not done anything to those classic frames that cannot be undone should I find that I want to restore them in the future.