Between 2017 and 2019 I made the Deans Sea Plane Tender SPT441 and concurrently made an identical plank on frame model which I called SPT409. Plans were prepared using a number of sources (which varied a little from Deans), and the build progressed with both boats, side by side, checking comparative weights as progress was made. A Pro 400 motor was fitted to SPT441, whilst SPT409 has a brushless motor. At first glance the two boats appear identical, but the moment the superstructure is removed the differences can be seen.