I built 'Dunlin' from Harold Underhill's plan for a Police river launch and elected to use the lines for a three foot model. I originally installed a Caton twin cylinder steam engine and Cheddar Puffin boiler but reverted to electric some while ago. The hull is mahogany plank on 6mm ply frames. Due to the fact that she was designed with an increased underwater body (to creat more displacement for heavy machinery) she weighs about 25lb and has great presence on the water. (Motor: MFA 500 geared 6:1) (ESC: Electronize ) (8/10)