Have you read through this one:
http://www.modelboatmayhem.co.uk/forum/index.php?topic=2227.0Bits used as follows:
From SHG:Motors, 16mm diameter servo motors
Shafts, 12" long 2mm diameter
Tubes, 10" long 4mm diameter
Props, brass 25mm, left and right handed, threaded 4mm but with inserts to take the thread down to 2mm.
From White Ensign Models:Wooden deck, more work but the detail is well worth it.
Brass PE set, useful additional detail especially around the tower.
From Historex:Hecker & Goros U-Boat crew. Stunning detail and well worth it for adding interest to a surface runner.
From Robbe:Rubber tube type couplings, smooth and light.
I didn't make any drawings I'm afraid, once I'd decided on the layout of the main parts I simply manufactured the pieces as I went along.