yours looks sound len, one of my mates had a sub in his spare wheel well, it never sounded right and like you said without some kind of very strong mesh or grille over the sub it defeats the point of trying to save space because you still cant use your boot, unless you want your sub wrecked. they sell protector bar things but they are pretty useless I reckon. They should make subs with like a protective front, i know of loads of subs that could have been saved by this.