Ok that changes how I was thinking about this, as I was thinking you were just going to build a box in that void behind the tire, where you held the salad bowls. That's why I was talking "single ten" (which, sealed, would maybe even be a little squeezed for space), and a single 10" with that flat panel 12" passive radiator - because then the tiny space isn't even a penalty.
I'm concerned when you say you are just building a baffle and trying to have it work as a sealed box, yet still leave your spare (and tools?) in there. It's hard to even build a sealed enclosure that uses glue, and sealant, with screw spacing more than 3", and have it hold. Even if you build a lid that has some angle iron arranged just inside the perimeter to really make it as rigid as possible, just holding that down by the corners (even if you were using actual hold-downs, like a machinist table), I wouldn't have confidence in that. I'd even be worried about the tools or whatever else inside rattling around, even if you did have a good seal.
I'm going back to trying to sell you on the '10" + 12" PR' idea
Or, one other idea that still would be perfect for a 10", if you don't mind a little work:
Build a removable fiberglass box with a flat panel top that will look exactly like what you are planning now - except cleaner - no hold downs.
My way really won't be hard - more like a craft project, promise:
Cut a frame. This will ultimately screw into the bottom of your wood fake trunk floor to join the two together. Cut out the whole middle, leaving maybe an inch all around - basically just a big ring around your trunk. You could make wooden walls if you want, sometimes it's easier to 'glass to walls than to get it to stick to something upside down.
Build a barrier - I was originally thinking plastic, but this is a perfect job for aluminum foil (which is fragile) and aluminum tape (which isn't). You basically just want to foil over everything in a way that doesn't leave many wrinkles. Spray it all with WD-40.
Polyester resin is cheap. Chop mat is cheap (get the thick stuff) and you just have to be mildly creative how you cut pieces for the corners (think band-aids for elbows). You'll want enough chop mat to do probably 3 layers of it - with all that shape inside there, you won't need much thickness.
Mix up enough resin and hardener to do a layer, first. Mix up more as you run out. Use disposable gloves because it's sticky. Lay some plastic dropcloth over your bumper to avoid getting it where you don't want to.
It's really easy. Think paper mache. And you'll have a proper sealed enclosure that's light and removable.
Or - a ten and a 12" PR.
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Originally Posted by Grinder
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