Hidden Sub maximising boot space of a car

I am planning on making a Subwoofer in my car that is put on in the space behind the wheel arch that maximises my boot space allowing me to still have a decent sub while being able to fit work equipment in the boot. 
how would this affect the sub?
are there any issues that would arise from this design?
is this a realistic build?
would this be an option for mass production?
would you buy/ make a product similar to this?