Steven,
As your only in Middlesbrough, why not come along to the Darlington & District MBC on a wednesday afternoon (12 till 6pm) or sunday morning (8 till 12 noon).
We have a number of members who have built their own steam launches, and I know they would be more than happy to answer any questions you may have.
You'll find us at The Waterpark, Middleton-st-george, near Darlington on the above days - The postcode is DL2 1JG if you have satnav.
Quite a few Paddleducks members are also members of D&DMBC - Myself, Walter Snowdon, Bob Golder, just to name a few... The kettle is always on, and you'd be made more than welcome.
Regards
Eddy