It's quite a time since I visited Ian Boyle's Simplon Website and when I did last evening...what a TREAT!  He's done a fantastic job updating it and it provides a masterful online reference.  If you want a totally enjoyable couple of hours, grab a cup of coffee, (or that strange brew our "dan undahs" drink), and surf through some lovely images.

http://www.simplonpc.co.uk/CGN.html

Check out the very early paddlers on Page 1 - Paddle Steamers 1822-1886 for modeling inspiration.

Here's one of my favourites
http://www.simplonpc.co.uk/CGN/Leman2-01.jpg

PJ
Victoria BC Canada