Well I've decided to go ahead and start making the scenery. I plan on sticking with the same size bases as the supplied tokens. For Impassible I plan on thimbles, corks with pins and needles in them, and old bobbins/reels. When something needs to occupy the space, I'll replace the scenery with the standard supplied token.
For the work benches, I plan to have a raised platform (2 matchsticks) with a small planked top (scored balsa) and stain/paint them in the same colours as the supplied tokens.
The fun part is going to be the toy boxes I plan to make. Since these will be off to one side, I'm thinking either a small chest or a crate. Once I have collected all the pieces I think I will need, I'll post up some photos.