duramix

Could someone please tell me where I can get my hands on some duramix.  I'm molding  amp racks in my rear side windows of my Expedition.   I want to use the panels as a foundation so I don't have to worry about attaching the amp rack a different.  I plan on making all three pieces one big piece(one covers the rear A/C unit the other two goes up to the headliner.  The only way I can think of doing this is to have 1/2 mdf cut to the same shape as the inner space (where the window is) then mold the mdf to the plastic with duramix, sand it down the the contour of the panels, make  the amp bucket and glass the whole thing.  I know glass doesn't stick well to plastic, but I think if a sand the panel down and drill holes all over the glass should stick.  The windows are power but I don't use them much and I plan on replacing the windows with sheet metal to give the truck a unique look later down the road.  Any input would be greatly appreciated.

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