Do make it 2x's larger than you want, ventilation is importand insulation is not, I like mine up off the ground so things can't dig under it, and did I mention make it LARGE cause there is a thing called chicken math.
Juise was it about the Lady Slipper? Cause my memory on those is drummed into my brain and raZ reminded me. Never pick a handful and bring them to your mother they are PROTECTED.
I'm thinking sand blasting is the only way chickflick. Just kidding the sand should wick away the water and dry quickly with warm temps and good ventilation.