[Goober]

Scrivy, 6'3 is not a problem for a lot of replicas. If you are indeed in a position to build/afford one, why not look at a factory built car. There are a lot of excellent cobras for sale at knock down prices. No need to wrench, just turn the key and enjoy.
If you really want to build and stay original, remember 90" wheelbase was the magic number. There are some kits out there that offer longer wheelbases and some 90" models with dropped footwells that will accomidate you. I am the same height and fit in a Superformance with plenty of room.

Just my 2 cents

Mark