From: Volkswagen Lupo build log

I found out that I was not going to use it, I tried to give it away for free, but no one was interested, maybe because it was made for a odd speaker size, 11" subs. Had no room for it just standing around in the already small garage, so out it went. Learned a bit more of what to do and what not to do when building a fiberglass/mdf combo box, so adding some points for experience and that it. Fine by me

Anyway, a N2 18" is maybe a much funner sub to have, making a pretty big box for it, about 7 cubic feet net. Tuned to 31-32hz, should hit the lows pretty good? I'm working on the box these days, it's looking pretty good I think

Back to the doors, I actually came across "readymade" door panels. They were not ready. Halfway ready at most Finish was good, but fitment was rather crap to be honest. Did not fit at all, needs major surgery to fit. But they look pretty good though. For a "proper" build they need to be modified a bit, they have really flimsy mounting points and if you were to mount speakers directly to it, the whole panel would vibrate bigtime. I might make new door spacers to fit the Focal midbasses, although they are nearly 8" in reality (specced as 7"), I should be able to fit them behind the door panel, and just use the panels as trim. They look like this:

and where they are supposed to be straight:

The lower parts of the doora has a really big opening behind the doorpanel:

so I made a cardboard template that filled this out:

and transferred the template to a 8mm thick plastic sheet:

This is fastened with industrial 3M VHB doublesided tape around the edges, and then a layer of Second Skin Damplifier Pro over the panel and its edges to seal it properly up.

Looks like this all sealed and dampened: