I havent personally done it, but xAoTx diffuse was telling me he got out there. Apparently there is a death barrier right along the edge of the building and u can barely move without dying.
Yep the second i looked i was like (sorry if i spell this wrong) "Holy Sh!%!, its the misriah arms plant!"
i watched a vid on youtube were there is a picture of a soccer ball inside some thing on foundry that you have to glitch to get into.
I've gotten outside of Foundry, it's pretty easy (just get a teleporter through the window, to the right, and not with the fan, lay it right outside) but when you do, you can only walk along a small corridoor or you get killed by the invisible elastic death barrier, the theater mode glitch doesn't work here, I tried, as have many...stupid updates...
Isn't there a scenery pic of the outside of Foundry posted here somewhere, I know i saw it somewhere.