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<p>I used to build retail systems with barcode scanners.  I think the biggest problem you wil have is the scanner itself.  If you use small economical ones, it works by a trigger control to activate the scanner and so you will have to find a way to do that.  Otherwise the more expensive constant-on or controlled by some kind of fuzzy logic ones will cost you considerably more per unit.  And of coure, the bigger the unit, the larger the opening you will need.  Just think about the ones you see in supermarket, that's a pretty big glass surface to have a reliable high speed read.</p><p>BTW, wow!  That's a huge layout!  Gives me a headache just to think about the amount of wires involved!  LOL</p>
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