well, further versions of a 109E are easy to make..... 3D work wise
Wellington would be much much more work... but anyway, it would be also on my top list for a future flyables:
first i love flying bombers, second the RAF needs a plane that can carry more than 1000lb of bombs
but true, a LOT of things have first to be solved in this game !!!
can you imagine a Wellington with the CEM and startbehaviour like the Blenheim ??? than better not ! IMHO