I have always had an interest & plan to build a paddlewheel steamer in the coming years once I get past this current warship interest. My BIG plan is to build Saito's Delta Queen, but that will be after I get more experience in building with wood.
If you haven't already, I'd recommend roaming several of the British forums since they have a lively steam enthusiast following on the other side of the pond.
http://www.modelboatmayhem.co.uk
http://www.paddleducks.co.uk
Other related sites that may assist in locating information & steam modelers:
http://www.pioneertelephonecoop.com/.../ISSlinks.html
http://www.steamboats.com