Welcome mate
Sounds like an awesome plan, I've done similar but no one bought 5's........it'll be a great experience
In fact come to think of it, we bought 3 cars - R19, 106 and a 5 series Bmw........so yes 2 French, 1 German motors, and it was the bmw that broke down in France and bearly did 150miles
As I've put in your project thread, for added realiability just take some time to check the electrics, wiring looms, connector plugs......as they are 20 something years old there is a good chance of corrosion