Thanks for the kind words
The main component of the debris is cat litter (unused).
I made a ton of little bricks with Milliput.... roll out a slab of appropriate thickness and then score with an knife. Once hard just snap along the score lines and you have bricks.
The little shingles are just strip styrene cut to length and the odd board or two is just balsa. My best advice is to just experiment and test things out.
Thanks again-
Jeff