nice build. 6 months ago i would have said to keep it all retro but i am about to do a very similar thing to you. old frames are way better than new!
I'm the same way inclined, why put old parts on really good frames. Components have come a long way in the last 10 years and shimano's trickle down technology mean that components costing hundreds in the 90's are now 1/4 of the price for the same if not better spec.
I really love retro builds they bring back so much nostalgia and make me feel young BUT I've experimented with the build on this frame and I love it. The reason I put modern parts on this frame was primarily because it was mint NOS and wanted a new bike look. In my opinion it works and works well.