I have been so impressed by a lot of the nice display cases I've seen,
and wanted to do something for my small collection w/o spending
Found some foamboard at Dollar Tree --- 20x30" sheets, $1 apiece.
It took 3 sheets (really, 2 1/2) to do the following:
As you can see, the second one came out a little straighter/better than
the first. Each case holds 85 cars.