HOLY CRAP! That corex is expensive from Home Depot!!!
Just an alternative for those who have sign supply shops near them, you can get the corrugated plastic (in colors too if you like!) for less than that, considering a full 4x8 foot sheet is only $15.90, and a 2x3 piece is only $2.39 (I get mine from
here)
And if you want something a bit stronger, try searching for "sintra", its a bit stronger, is not corrugated, yet still easy enough to cut with a utility knife. Its a bit more expensive, but does not bend or curl when it gets hot/cold.
Oh yeah, nice writeup on the false panel, I like it!!!