I'm with you on the idea. I've been contemplating an exterior facelift myself, the only drawbacks for me would be the fact thst once I would stsrt stripping the front fenders I'm sure there would be some classic 156rust lurking somewhere beneath - probably on yours too so the quedtion is are you up for it?
The other problem for me would be the fact that my car is dreadfully silver which I'm sick of.
Do a search on this message board about the interior facelift though because there was a thread from a few years back with extremely well documented swap from old style dash to facelift dash including getting the top mounted centre infotainment to work properly. Search around and you'll find it!
Hope you really do go for the facelift conversion because that front end really does seta lowered 156 v6 apart!
'77 Giugiaro GTV 2.0: newly restored, fresh Rosso 530 paint/tan custom gtv6 interior, ported&skimmed, CB47, high compr.pistons, iresa header: 160hp
'06 Bertone GT 3.2: metalic black/red interior, lowered, custom alu adapter and 78mm Porsche throttle body.