I can not honestly say that it would or would not be a big job. I have never thought about doing that. When we found this boat for sale it was the only 34 Pilot that we looked at that had a full aft enclosure. I didn't know they offered that option. The boat surveyed above average condition, fresh water boat and a the previous owner went above and beyond in maintenance. We would have purchased the boat with or without the aft enclosure because of its condition, twin engines, bow thruster, fuel capacity, water capacity and mostly this was the boat we were looking for. The aft enclosure was to us a huge benefit for doing the Loop. The enclosure added livable, dry, better climate control, lockable living space for us for the Loop. We cruised on board for 14 months. 34' is a small boat to live on for 14 months. The enclosure was a game changer for us. We had a custom screen made for the aft doors. We leave them open most of the time and with the screen inlace no bugs in the space. All hatches and port windows have screens.
The aft enclosure was installed by Mainship but it was an add on. The designed the enclosure to fit the opening. I can take a look at the install to if the aft enclosure could be removed without damaging the integrity requiring additional glass work. I have never looked at this before. More would I personally want to do this. If I wanted to make it a rag back the most I would do is remove the back doors.
In my opinion the boat is turn key ready to go. If I don't sell it over the winter we plan on launching next summer cruising the Ohio River, Tennessee River, TennTom and spending the winter in Florida. That will be the boats new home. Winter Florida cruising, Summer inside storage in hurricane protected building. If I do sell it we will go back to a trailerable boat.
Good luck in your search for a clean 34' Pilot. I have owned many boats and captained many more. I can say without a doubt that this 34' boat for its size is the best handling boat I have captained. When docking I call it a boat with training wheels. Anyone can handle it in tight fairways with current and wind. Twin engines and a bow thruster. The boat will handle comfortably 3' to 4' chop @ 17kts. WOT 23.5 knots the way we were loaded for the Loop There will be some spray on the windshield but no pound! and rock solid in the water. It will surf a following sea quite well too. If it falls off the waves it has the power to climb and ride. I have put about 8000 miles under its keel and have had it in all kinds of sea's, 0 to 6' with no issue. We cruised in 8's from Atlantic City Nj. to Staten Island, following sea's 12 second period. It was like riding on a surf board. Not really waves just big rollers! It was an awesome day to view the New Jersey shore line.