I would not change out the cranks, that is stunning looking.
Also, the hubs are grease port Campys, those are very nice hubs and very easy to maintain, all you need is a small bicycle grease gun, insert the fitting into the hole, and gently squeeze the grease which will ooze out of the sides of the hub, keep it oozing till the grease looks new, wipe off the overflowed greased and you're good to go, no bother with taking the hub apart and cleaning and regreasing. I have a set of Campy and Suntour hubs that have those ports, the Campy was made in 1976 or 77, and the Suntour was 84 or 85, and they have a lot of miles on those bearings but because I keep the grease clean they're still rolling on the original bearings; all my other types of hubs I've had to replace the bearings, but only because I'm too lazy to do all the work to keep them happy.
The rims look sort of bad, appears to have wear grooves on the sides and some corrosion as well.
Now for a more of a personal opinion. I know you don't want to do this, but you already have drillium crankset, that bike would look really cool if you continued that look with brake levers. Putting 90's era stuff makes that bike look out of place, as the current derailleurs and shifters do now. Keep in mind, that the further you get away from the type of components that came with the bike, the less it is worth. Just a thought.
By the way, Velo Orange has drillium cranksets as well as drillium brake levers, all brand new, they have downtube shifters that look old school but are brand new. So you can either go with mostly newly made drillium parts, or go with all old school stuff; the problem with old school cranks is finding the gear rings when they wear out, so going with the newly made one eliminates having that issue. Don't be scared of older parts, if taken care of they will last a long long time, I have a bike made in 1977 with the original Campy components, and this stuff just doesn't die, same with my 85 bike with Suntour components. Having a bike with drillium parts hanging would be the source of many conversations when out riding, you would have a very unique looking bike, and I have the feeling that the bike originally had drillium components due to the crankset, if that is true your bike is probably an early 80's bike? Also, when Dawes came out with those cranksets, the bikes also came with Campy Nuovo Record derailleurs, those are the derailleurs I have on my 77 Raleigh Competition, they are very beautiful to look at, nothing made since those look remotely to the artwork detail done on those derailleurs. You can pick up nearly unused, or NOS Nuovo Record derailleurs for around $100 for the rear, and I saw the complete package, rear, front derailleur and shifters for $230 on Ebay.