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I've given this subject some thought and was wondering if a "hot wire" might work to "drill" thru the foam. Those hot wire cutters slice right thru the stuff, so I was thinking that taking a solid wire, or small diameter rod, heating it with a lighter or match, and applying the hot end to the foam might cause it to go right thru the foam. You could even attach the feeder wire to the trailing end, and feed it thru. You'd have to drill a larger diameter whole thru the plywood on the bottom and hope you "hit your target" with the hot wire. This would be more work than drilling thru all layers with a long bit, but if you wanted a really small diameter hole - it might be an option. I've never tried this, but the time is coming soon where I'll need holes for feeders, so I might give it a try then. Hope this helps, John
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