few things you'll find with a triple wide projection set up,
you'll need lots of space to accommodate throw distances, or get projectors with wide angle lenses, as you may have already figured out based on your Optima GT720 recommendation, If you do opt for wide angle projectors, you'll not be able to get 1080 unless you spend allot of money! Most of the ultra short throw fixed projectors are only XGA (1024x768) in that case you'd set your TH2go resolution to 3072x768
also you'll need to think about software to edge blend the projectors, unless again you spend allot and get projectors with edge blending built in. Warpalizer does do a good job, and would be suited to your requirements. Also take into consideration that ultra short throw projectors like to be on axis, meaning that the center of the projector needs to be about center of the screen, so no ceiling mounting. Last thing, keep in mind when shopping for a projector that the native resolution is what the projector actually displays at. That optima you have cited in your original post is only 1280x800, not 1080p. I know it says it can take in a 1080 signal, but that doesn't mean it displays a 1080, signal...
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