I can upload pics later. But basically the 3500 still has the rear underseat dish pockets unlike the flat-ish floor of the new 1500s. But The build was pretty straightforward. Took a sheet of mdf and cut it 24x 61. had to cut slits for where the seat brackets sit and a hole in the front that kinda looks like the racetrack lights on the back of a durango or charger where the pockets are. Traced and cut the front profile to match the seats when theyre folded down. Lined the carpet with masking tape and plastic drop cloth (so no glass/resin gets on the carpet). laid the glass in the pockets and overlapped the mdf about 2 inches. Traced the whole front edge with curves onto three more pieces of mdf to stack and continue the curve of the bottom plate and gain depth on the front. The back has no stacking so the top plate slants back to allow the seats to fold down and attaches directly to the bottom plate. cut angle pieces for the slots for the seat brackets and another 24x61 piece for the top plate. Traced cardboard and cut support/anti-flex piece for the middle. Glue, screw, cut sub hole, contact glue and carpet. Probably sounds worse than what it is, but longest time was in waiting for the 4 layers of glass and resin to harden. You'll have resin smell for about a week until it fully cures, but it allows for a way bigger sub, depth and magnet diameter-wise, and if you do the whole underseat area like i did you end up with about 2 cu ft of space.You have any pics of the installation? Going a similar route and want to see how your box design was done... thanks
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