Also excited to hear about the B-50 project....now that sounds tempting !
Part of my long term plan has been to build all the major in-flight refuelling types operated by the USAF and its predecessor. I have Academy kits of the KB-29P and KC-97L along with AMT kits of the KC-135A and R along with enough bits to build a KC-135E. I also have the Heller KC-135FR to build.
Other B-29 family builds/conversions I have are the RB-50G and a SB-29. I also recently recently bought the Plava detail/conversion sets to convert a B-29 into a Tu-4 which I am tempted to build in RAF markings to see if anyone notices the difference

My main focus at the moment is building the Whirllybirds P.1121 but at the moment my back is hurting so I am not exactly thinking about that. I also have several Hawker Fury builds I am tempter to work on. These are based on an article in Model Aircraft June 2011. I say based as the author did his builds as quick builds so has some details wrong such as the contra-rotating props on his Gryphon Fury. He turned a propeller around so that it looked as if it was rotating in the opposite direction from its twin further forward, however the shape of the blade still shows so it looks as if the rear set of blades are pushing air over the nose while the forward set of blades pushes the air over the fuselage

but he did do his build in a hurry so I am not going to complain too much especially as some of the other details around the engine are wrong. Saying that, my build will not be perfect, just better.
Gondor