I've been watching it fly for about a week now. It IS beautiful and the R-3350s are very similar to the units flying in the B-29 "Doc." They'll put a few more hours on it and then likely depart to have some temporary seats install before flying it to Oshkosh.
The engines were rebuilt by Mike Nixon and are running like new units. The aircraft currently has no interior and no passengers, so it is rather sprightly when taking off and climbing out. The sound is right out of nostalgia central.
They did something unusual.
This will be a private aircraft and they cannot expect airline personnel to be ready when they land, so Fighter Rebuilders built a custom hydraulic folding stair set and installed it in the aircraft. So, they don't need any assistance to board or depart the aircraft. It's all self-contained.
Cool to watch.