I'm trying to figure out a cheap but strong improvisation for the side door....and a screen type barrier for when I have the ramp gate down. Got to keep the cat in, bugs out and well ventilated. Hardware cloth isn't cheap, but doable for the side door along with reg. screen. I thought about 4x8 lattice cut to fit the ramp opening, but would still need screen and hinged 2 piece frame. Anyone dealt successfully with this?