I've got the beginnings of one of my own for once! (I'm using imageshack for the WIP pictures - not going to waste precious SFM space on an unfinished work!)
It's similar to the MkII (Mk III or IV?), but the wing and upper fuselage are one smooth surface, and the two lower engine intakes are completely below the wing. A lot of this will become more apparent as I add more detail.