Coroplast Correx advice . . .

Usually the correx/coroplast tray goes inside the grids. For 3 grids wide, you'll need to score at 41 inches, that leaves 3.5 inches on each side. That's high enough if you use fleece. For bedding, there might be more bedding being kicked out.

If your piggies are not babies or on the smaller side, you don't need taller coroplast sides (10 inches is recommended for babies)

Of course it'll fit inside! Silly me! Thanks xx goin to get making today! Eek am excited! Xxxx