I'm Robbie. Planning on how to turn a Promaster 136wb high roof into a campervan for two. Want to intall a manual bed lift to store the bed on the ceiling or install hinges above cab for a pull-down bed. Glad this forum exists.
Welcome! SOunds like the "over the cab" idea would be tough, but the bed lift in the back seems do-able.... some 6' long threaded rods might be useful, or the screw drive rod they use in garage door openers.