A Colin Facey CF21 might do the job, 21'Long ×8'4" Beam(i think, will check later), little Yanmar 1GM10 inboard diesel on outdrive(well mine has anyway), tall enough to stand up in part yet goes through Potter pretty easily(think I had 6'3" on the gauge last time n it wasnt tight tight), galley and seperate heads(mine has a proper loo n tank but not sure if they all did) and two doublish berths or two single n one double.
Think the same mouldings were used by others too.
Hope thats of some assistance:)