The right thing to do would be to replicate all the work Metalcraft did on their pan-replacement chassis.
Greg could just carry on as is, since the bodies would be unchanged.
Carey and Henry would have a lot more work to do, but they're mostly there now.
Henry's proprietary frame accommodates 911 or Subaru gear already.
Carey's new coupe frame dumps all the VW stuff and has different engine/trans cradles. He just needs to make it work for the Speedster body as well. Don't know his plans for Spyder frame/chassis changes.
Greg is working on his Spyder frame now(a la Bruce).
I wish all the manufacturers well in their efforts to move our hobby into the century we're already in.