Building a WW2 plane from scratch, how hard can it be?

[FunkyNige]

There's some talk on the Vulcan XH558 thread about what a shame it is that there aren't any Stirlings flying and that the drawings had been destroyed, but why is this such a big deal? I'm sure there are plenty of photos so the outside so the basic structure is known and modern know-how will sort out the details to get it in the air, plus the avionics (or whatever 70 year old wires connected to flaps are called) won't exactly be rocket science to engineers these days, neither will be bracing holding the whole thing together.

So, apart from the money aspect, why can't someone with infinite money (to keep it simple) make one?