Brother, from what I've just read, you have your detector covered five sides in metal and a polycarb plastic "nose". By placing your detector within a metal envelope you are severely limiting its performance. I get the front is not metal. This configuration will eliminate reception from all but head-on.
Maybe, but when you live in a state/providence that frowns on RD, it may be (is for us) an acceptable tradeoff.
I’d also wager your body, with a dash mounted unit is only slightly better than the aluminum box. And most detectors (yeah yeah V1 fans) are front only anyway.