On the subject of design over the decades, I too set up my bikes as close as possible to my target position. Keeping in mind that at the time of mfg. the concepts of a good position on a race bike have changed. Profile views do not account for changes in handlebar width for example. Ideas on where the saddle belonged changed. As mentioned earlier the seat posts with a horizontal extension, often got a more modern seat position in relation to the crank center, I found it interesting that it took so long to be admitted by framebuilders.

In the 70's fashion was indeed moving the rear triangle tighter, it looks more "race". With the wider rear ends of 10/11 speed bikes, I am surprised it has stayed so short, 415 mm or more I think would be better, not the sub 410 often seen today.

I have a smattering of bikes from the 50's to the 90's. I was surprised that the 50's bike was as "modern" as it was. Probably though if I was buying a bike way back, I would have been fitted to a larger frame. On the 50's bike I was guessing from the images when I bought it the bike was 72° parallel, and the top tube was close to my favored length. The front end is relaxed, as is the rear end which I think is near 440 mm, a great "white road" bike for me.

The Oregon Manifest competition is interesting, like all design contests the appearance is given higher priority than the required utility. As with any design competition, one must know who the judges are before deciding on a design to build. Unless you are going to build the bike anyway.