Thats a really cool diorama. One thing I've noticed is when you use the eyeglass wipes is that they have to be fresh. I tried to use some I got 3 months ago and when I opened the packages they were all dreid out.
RNK used to have some kinda like that in resin but they aren't in business anymore. You might try Spaulding Trading and Shipping. If the tires you want are not on their web site try the paper catalog it has a bunch more stuff.
Just got back from taking ther wife and 3 year old daughter to se it. What a GREAT movie!!!!!! I think I liked it more than they did! Definatly a "must" buy. Hats off to Pixar.