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Have a look at the forum post:A Star Wars Miniatures Battlesabout page 10 or so.Pretty good inspiration and ideas on how it was done. Here's a couple of images
Only thing I'd argue against is the initial layout you posted. That's incredibly boring/repetitive. I'd split it into more smaller platforms with arches crossing over each other, etc. Add a lot more variety and visual interest (as well as better gaming options). I think you could help ensure that each sub-platform has one or two ways off to prevent people from getting too bogged down.