Thanks, both, for all your work on this project already.

D'Lanor, you know I will need to just let you get on with the wiring -- I didn't understand your last few posts...
ametist, you're making very good progress. Some specific comments (as requested):
The shovels and piles of sand look good -- a nice idea. I also like the wheelbarrow.
I'm not so happy with the grass texture -- it looks too smudgy and contrasty, especially with the black areas on it. The sandy texture next to the tiled areas similarly looks smudgy. One of the terrain textures I use regularly in OSgrid is based on Genetica Viewer's Common Ground, but it might look a bit too strongly green in this context -- we need that colour strength in OSgrid. Could we try that perhaps for the base? What resolution would you need?
Shed: I agree that the workers would probably move their shed from site to site. In the UK it would probably be a battered old shipping container for extra security. I like the Swedish log-cabin style, though (since you are in charge of these workers!). One pernickety point: the texture on the two wall ends will need to be turned through 90 degrees, so that it matches the rest of the log.
The tiles for Quin's and Dot's floors are perfect! The choice for Quin's will hide oil spillages and that for mine will complement the modern ash desk I have my eye on (yes, I use IKEA for office furniture).
The sign at the entrance will be a temporary one for now, as you might see at a building site in a town.
Hope this helps!