Willy,
I wouldn't worry too much over the solid rotor issue. Huge vented rotors and calipers with massive breaking are really impressive and do work well, but remember the original cobras all had solid rotors and managed to stop when they needed to! Hell, because I am racing my FIA as original. I still race with solid rotor Girlings and Girling calipers and they do work, albeit I had to add some additional cooling to them to limit brake fade, but again we are talking in race situations where you are braking hard repeatedly and creating a lot of heat in those rotors. So, unless you intend to behave like a teenager and push the car to the limits on the road, scaring the hell out of everyone on the road with you and putting everyones life and limb at risk, don't worry about it.
If a moose jumps the road in front of you and you can't stop in time
, just duck your head and you'll go underneath it anyways!
Nice work and attempt at keeping things looking period correct.
Jim