I doubt the red car is an Alfa. The wheels are straight off of an early fifties Lancia. Plus, look at the size of the thing in comparison to the GTV in the background. Early Alfa sports cars are much bigger than the red car. Methinks it's a homebrew based on an Aurelia.
The silver car in the second photo is a Lancia Flavia, as it says so on the bootlid. Dunno who did the bodywork, though it looks a lot like the Touring work on the Flaminia convertible.
-Wm.