When glass becomes a problem in map making, I just use the metal poles to simulate the frames that would normally hold the glass.  And just don't use any glass.  If it didn't lag so much, the co-op map that maxpower and myself did would be full of it.

I've had a chance to see the work that PBS did with my map, and it's remarkable - it runs very much better than it did before. He has worked very hard to get the performance down into the yellow for most of it (it was mostly in the red before) and in some areas it's in the green.
There are still a few spots where it's red - but there isn't any way to fix this due to too many issues to name here - mainly structural though.

PBS has managed to fix these problems and leave the maps layout/structures/details untouched. It has renewed my drive to finish the map now, and I will do so over the next week or so. I can't see any problems with this being playable for a smaller group of players - maybe 4-8 - perhaps a full room would prove a problem, but I'm very happy that it is going to be played at all

@PBS and DEEZ, I've done just that - removed all the glass, and there was another marked improvement in performance, and again when I removed the explosives - they weren't necessary, I only put them in when I start a new map, it's quite nice when you remove them towards the end of a build and find you've freed up over 2000 in resources

A massive thankyou to PBS for all your hard work, it's very generous of you, with your permission I'd like to credit you as a co-op builder.

Thankyou also to all those that contributed advice here, DEEZ, Neg, FC302, Rob - your inputs are all very much appreciated

Thanks also to maxpower (who posted while I'm writing this lol) There are some great ideas there, I think I will go the way of reducing the archways using fewer pieces.

The walls are a sticking point for me atm, I would love to use occ. blocks here, but doubling the thickness would compromise the scale etc - but you're right they are essential, I will endeavour to address this too.
As mentioned above, all glass has now been removed, and it still looks pretty good. I like DEEZs idea - to use the pole to simulate window panes, I'll try to work that in too.

Once again, a big thankyou to all who have offered advice, and especially PBS - as it's a bar/brothel, I'll treat to a 'freebie'....on the house lol....that's a free bear of course lol....hope you didn't think I meant the other thing lol 

Thanks Neg

Yeah, on/off toggle would have been nice and also (*takes deep breath*)....well, that's for another thread actually, but for sure there's a lot of stuff they should have done - as you say, 'oh well' lol

I will look seriously at the walls tonight, I've extended one or two already, and it's looking pretty good, you're right - there isn't much of the movie that's set inside, so I took some artistic licence here, and I guess I can live with narrower corridors - trouble is the large, open bar area is going to be tricky - no walls to work with here.

I'm going to keep working with it though - a big improvement to how I felt a few days ago, I was ready to trash it, and cry for a week lol