I ended up mounting mine in the doors just above my deflex pad for my speaker.
After v-blocking the inside of the door, I wrapped the whole crossover in electrical tape, cut out the bottom piece so i could get a good bond, then used epoxy in the middle and gasket sealer all around the edges for a more or less waterproof seal. Then I sprayed some quiet kote (or w/e) over the top of all that after it was all mounted up. Worst part was holding the thing in place till the adhesive took hold.... I let it sit for a day before putting doors back on just to make sure it all was going to stay put. I ended up putting my amp in the trunk next to my sub amp, I was going to have to take BFH to the "hump" to get it to fit and I just ccouldn't bring myself to do it...
I thought the stock tweet just had a small capacitor?