There is an article I think of someone that modified theirs in to a 3pt. I am doing the same here in a couple weeks with mine. I have a loader on my 1655 and to be able to move the loader I have to turn the pto on to run the pump which means the deck is on and I don't like that. Plus I don't want to have to keep taking the deck on and off of the mid mount position due to being a pain in the butt. I will see if I can find a link. The good think is the support brackets that are already on the deck will make for a good a-frame mounting spot.
It is for a different mower deck but for the same tractor. Using the Massey mower deck would be really easy because the gearbox is already there, just the a-frame would need to be built and casters added to all for corners with height adjustment.