Welcome back, Vamp.
Contrary to what the Main Page says in the new design, we aren't a "Thomas only" forum and there are boards for discussing all forms of toy/model trains. Indeed, you have found a great place for advice on modding, scratchbuilding and collecting.
Regarding the Sodor Construction Company: I made cardboard models of Jack and Alfie with plastic wheels, hot glue faces and a plastic arm for the latter, but they're out of scale and not meant for TOMY/TM road. Looking forward to seeing what you plan to do with them.
If you'll ever have issues with navigation, you could contact Super or TheHSVDude via PM and they'll help you with anything. As I used to say, "enjoy your battery-powered ride".