right, there is a company named kingston mouldings and they do the 1939 german schnellboot s-9 and it dimensions are as follows Hull Length:1070mm (42") Beam:155mm (6") Scale:1/30th it will set you back £62.75 + £9.50 p&p, and it also comes with drawings, and if you want to go in to more detail go to john lambert plans.
kingston mouldings -
http://www.kingstonmouldings.com/home.htm
john lambert -
http://www.lambert-plans.com/
hope this helps
chris