Though I checked and didn't see this  on PDs website list, it may well be here so forgive the repeat.
http://www.clydesite.co.uk
lists 20000 ships in searchable database, some with photos. There seem to be about 1000 paddle steamer listing, some with basic facts, some with history summaries. Search by mfgr, type (best way I think by putting in paddle under type).