Great work on the PDF! I really like your ideas on sealing up the small opening in the OEM sub box. I was going to use MDF but the clear look is really nice.
On a side note, I've installed a few systems too and ideally you want to keep the fuse literally a few inches from the positive battery terminal. I know it's extremely unlikely that there will ever be an issue but knocking on wood as I write this, if there were ever a vehicle impact or something that could damage that power line, there would be 4-5 feet of live power wire that could cause a major fire or with a prolonged short circuit cause the battery to explode.
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2007 BMW 335xi 6MT TiAg
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