i guess it would be helpful too as i go to tell you what i used.
from michaels :
7x7 wood base (they have a variety of sizes)
paperclay is what i used on the wall and street. isnt really clay but works just the same.
7/16 inch styrofoam board to cut the wall out.
amaco 1/4 inch copperform mesh to form the side walk.
from my LHS :
1/16 or 1/15 brass tubing for the sewer grating.
from my draw :
paper clips for rebar. the rigid kind of paper clips look much better for this but i was out and got lazy so i used plain old paper clips.
match sticks which i burnt to put in the 55 gallon drum.
spare parts box.
55 gallon drum from tamiyas
the 55 gallon drum i took my dremel to it and made some holes then i scuffed up the whole drum with a metal polishing wheel to give it that not so new look
i will keep better progress reports as i go along
kenny