Aqua space craft
Compact, maneuverable, one seater space craft which is a tribute to the small lego space sets I loved so much growing up, made with modern parts and building techniques.
The build is very sturdy even although there is building in 6 directions! There are no illegal connections and I think all the pieces would be found in standard town/creator/CMF sets, but if not, there are easy substitutions that could be made.
159 pieces plus 1 minifigure, and fits on a 16 x 16 baseplate with very small overhang on the edges of the wings