First, congrats on a successful first few months opening your own office. It's such a perilous time right now, it's awesome that you are making it on your own.
Your LOOK is bad-ass. Totally different direction than mine, but it turned out great. The Mondrian-inspired design works well with a modern aesthetic and parts. I think the blue cage with yellow buttons is a nice touch. I'm glad I had a second set of water bottle cage mounts added to mine, but I do envy your beautifully preserved original paint. I hope you're as happy with the ride quality as I am with mine. It'll be interesting to hear your comparison between this LOOK and your 753 Raleigh.
Just a curiosity: I may have missed it earlier, but is there a reason that steerer is so tall? Do original steerers usually come with so much extra length prior to cutting?
One difficulty with converting this '80s steel warrior into a modern racebike for the present day Parallel Universe is tire clearance.
In the modern peleton, a 25 mm tire is narrow, 28 mm is common, even wider on pave. Today's carbon frames have the tire clearance for those widths.
For this frame, test fitting a 25mm (outside width) rim w/ 25mm tire (clincher) has 4mm clearance in front but only 3mm clearance w/ rear chain stays. See below. I'm likely going with tubulars, but even so I don’t think 28s will safely fit....
Fwiw, I'm using 27mm Challenge tubulars on my LOOK. They are tight, but certainly not too tight. I'd think 28mm tubulars should fit as well.