Good for you, Rob, and very best of luck in getting this unfinished project finished. There's a thread on the Forum (others more skilled than me will doubtless post a link to it) lamenting the number of 126s that are sacrificed on the altar of a bike or other mod (typically involves transplanting in a Jag V12...) never to return to the road and end up on eBay or that great car park in the sky...
This project was in fact featured in that very thread, as I remember well, having made a comment myself regarding the likely comfort (or agony...) of spending more than a mile or so in the driver's seat, so it will be gratifying indeed to all of us if you can succeed where others have boldly gone before you, only to falter along the way.