Mercedes 309d van diesel bus sprinter

1972 Mercedes-Benz Other Additional Info:

Selling my 1972 Mercedes 309d, bought it to convert into a camper van but ended up moving and do not have space for a project of this size anymore.
It is not originally a panel van, it was a bus first with windows all around. Someone in the past has put the paneling up and removed the original windows. I do have the original windows if you wish to convert it back.
Will need to be transported, the engine runs strong (these engines are known for running well over a million miles) but the brakes aren't working properly. This thing has air-brakes and I do not have the first clue of how to work on that type of brake.
Also needs clutch work, when I drove it last the clutch kept sticking in gear when I tried to shift it.
Has a little bit of rust here and there, nothing major. Frame is super solid.
This baby will make someone a great camper/food truck/work van, it is just too much of a project for me right now.