A few of the swift conversions have been done with most of the inner wings still intact. Thinking about it now, mine would still fit within the inner wings but I had cut them off for my flip front.
The driveshafts havent been made yet but from what I can tell its quite easy. You line up the hubs so that they're level with the inner cvs on the box, then measure the distance between the two (from right inside obviously) and I think you minus about 5mm from that distance(will double check when I get round to it).
Ill try and answer any other questions if I know the answers to them

King