@UNBROKEN, Your work is phenomenal, hard to describe how much I respect it. It's been fun watching you play. I'm someone that has spent many multiples of 10K on quality home and automotive audio gear. That said,
I have a lot of parts that are aftermarket (read: many of my joints), and getting comfortable in the seat or sitting for an extended period of time is tricky.
I'm someone who keeps their vehicle as clean as it gets, my floor mats are not dirty. I can't help thinking that if I were driving your vehicle, the speakers on the floor would simply end up as a grate to clean my shoes on. I'm sure you've considered it, but isn't there some type of acoustically transparent fabric that would help keep the debris from ending up in the floor speakers?