Nothing wrong with over engineering things a little, at the end of the day it's your peace of mind and what you are happy with doing 
FYI, both Jim-GR and Nis have turbocharged the CGA3 which are open deck and they are both pusing 220bhp, Jim-GR probably more. Last I saw he was running somewhere around 1.7bar boost and revving to 7000rpm+.
