ok, here what u do. buy q forms that fit ur car not the universal ones. buy fiberglass and deadener if u please.
2 things are bad about q forms.
1. they are hollow
2. they are not extremly reinforced, somewhat flimsy.
solutions.
1. depending on how good of a fit the q forms fit to ur kicks and whatnot, u may be able to get away with just adding poly fill / acoustic stuffing and u dont have to worry about it being hollow.
or you could create a back section for it using fiberglass. i think ud probably want a pod since ur dropping a 6" driver in there not a 4" like me.
2. due to the kick panel being somewhat flimsy, u can do a few things, i prefer two. reinforce the hell out of them with deadener and or fiberglass. a couple layers of both work quite well.
also u can attach a mdf baffle to the back of the mold where ur suppose to attach the driver.
Hope this helps for others................
but....... u have a problem...... soooo id recommend u look around for fiberglass how to's when making kick panels, i personally have not done this, however, i feel it be a good learning experience to possibly open up options in future for sub enclosures, another try at kick panels, door pods etc....