HI Georgeo
take a look at Tyne tug model website I have the Northsider they do brilliant tug kits

hiya Damon that would be great if you send them to me I would really enjoy scratch building a tug thanks for the help mate

George, if things become desborate I made a tug from scratch, I put all of the cut out's onto card I'd me more than happy to send the instructions with copies of these cut out's just take a while coz there's a lot of them? Hope this will help if all else fails
Damon

There is always EBay and or the sales sections of model boat forums

Mobile Marine produce several suitable tugs and Model Slipway also have offerings.
Both have web sites with details and prices