The CF6-80 powered -300 (pax and frieghter) variant is the basis for any further developments, this includes additional engine options. The PW4000 and the RB211 ( Trent was never used on the B767 ) are considered but it all depends on how much quality information I will be able to obtain about those engines.
I'm working on it on and off, but it's slow because I was focused on the A320-Family. The A320 3D and any user paintable parts of the texture are basically frozen, I'm in the process of making the paintkit, so soon it will be at a stage where the workload with it will be smaller and I can go back to the 767 as the main project(but also assisting others where needed)