Overlay doesn't require a script. It's in WED, provided I'm recalling correctly. But yes, you make a chain-link fence as a 32-bit TGA. Just use a model for this and tile the texture. Want a small example? It's just four vertices and two triangles (four triangles if double-sided).
"You level up the fastest and easiest if you do things at your own level and no higher or lower" - useful tip
My 2D game - release on Jun 13th; My tutorials
