It can be done and I have had at one time all the parts to do it.

To mount the lens you need the front off of an early model Hassy bellows. The back would have to be fabricated from the back plate of a junked Hassy body plus the bottom and top "bits." This works only for the old style A12 backs that have the window in the back. Otherwise it can be very involved to incorporate a film advance mechanism into the back.