How about some major surgery?
It's not finished yet, still need to install the canvass tomorrow and later the actuators but coming together for sure!
First, I built a frame to support the upper bunk along with wooden sleeping platform. Sounds easy but I was getting fancy and took longer then I could afford, lol. The bed platform has 3 positions, low (5'7" clearance), medium (5'10" clearance) and high where it will be attached to the poptop ceiling for maximum clearance when the top is opened up. It can also be easily removed if I don't need the bed which yields 6'4" of clearance.
Then I cut a giant hole in a perfect roof. Always a bit nerve wrecking but been there done that before
I followed by welding a custom frame to reinforce the ambo roof and sealed that inner frame with Sikaflex.