Jason, good question, sometimes I feel like everyone should be on the same page I am, how untrue.
You may notice that I have now released a clue to the location of my hideout.
I'm thinking in the 1/2" width range.
My first thoughts are, like Dave suggests, leather but I'm thinking that leather won't work as it would probably have too much stretch at that size range, unless you could possibly prestretch it.
Green is positively out of the question, it would destroy the look.
And, although I would rather any such belting would at least look "leatherish", I woudn't mind doing some experimentation, perhaps leather laminated on a more substantial substrate, but I think thickness would probably limit that. Or posibly faux leather?
Gail's link would be the easiest if the belting could be spliced to length, or the project be sized to existing belt sizes, but is subject to the "leather look" limitation, but better than green.
Still wondering if the crowned pullies or flywheels would function as in real life size machinery.
Oh yeah, I'm thinking about driving a generator
, of course.