Back 2016 built two sturdy 4ft x 4ft tables. Put them together for a 4ft x 8ft 1/18 scaler indoor garage course. Used real rock, stone and gravel. It would have worked even better with 1/24 scale.
Apparently, the wife thinks I should make room in the garage for her car, before I can start my 1/24 crawler course. she's completely right, but it still sucks!