I believe Hobby Boss has announced a 1/32 B-24 Liberator, so a plastic base for a Privateer conversion may become available. I'm not sure if HB will do a Privateer, as it would require an entirely new fuselage and engine nacelles. But never say never - they could mold the basic B-24 fuselage in front, mid and rear sections to cater to B-24 variants, then engineer separate engne nacelles to allow a Privateer to be made.
Gosh darn it, 1/32 is the new 1/48 when it comes to WW II heavy bombers!