i would be really pissed that u cant finish this map, i dont know anny gliches about OLN but mabey you could think or a way to end the map as it is now beause it looks fine the way it is, it looks like a cool close combat(minus the giant room) / infection map.
Your best bet would be to build it at the bottom of the crypt. Then you make high walls rather than a roof. Or you could built it in the skybubble using railings, but that my alter the gameplay a bit much.
Yup the latter would affect the line of sight i was after.. close quarter bases, open centres would turn into open everwhere.. Also, using the crypt fall wouldnt really save any items, because my lowest point is only a small part of the map, i'd probably save only 8 block doubles, and then in high walls i'd need at least an extra 30 items. It also wouldnt give the solitary effect.