I say GO FOR IT but just make sure your eyes are wide open.
I say that because...
1. You are using my favorite car...an early A, but you already know how small they really are and...
B. Any time you are doing anything like a turbo or Pro Charger getting exhaust is really the issue.
When I first started playing with turbos it was the same deal. Exhaust is critical for good turbo performance and making all that fit in an early A, especially if the inner fenders are still there is the perfect storm for making your hair fall out trying to get a decent exhaust system on it.
If you can deal with that then you'll find much of the rest of it pretty pedestrian really.
What book are you reading?? My only turbo book (if I can find it) is from the early 1980's.
