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It may scale up. You should use several heating fields under the platform and supply them in parallel (the aluminum spreads the heat very evenly). Of course you need a sufficient power supply for that, or several supplies in parallel and, more important, you should use several switches (e.g. SevenSwitch) in parallel, because their abilities are limited too. But if you scale up everything in parallel it should work like charme.
Off-the-Grid Lighting Solution (LED Moser Light Evolution)
Stop using Ferric Chloride etchant! (A better etching solution.)