Looks great. the adjustable car seat is a nice touch.
Im hoping Im sounding more constructive then critical as that is my intent.
The only think I question the wisdom on is in placing the computer in front of the pedals. If your foot slips off you may hurt more then your toes.
I personally would have put it behind the seat and placed the subwoofer where the machine is
Might make a couple of suggestions.
A piece of think Plexiglas between the pedals and the machine as a kind of kick plate. Or, it looks at though you may have enough room to simply raise it.
That would solve your machine on metal problem
Run all the wires inside the tubing.
Overall though. Great idea.
With some refinements I think you could actually sell those things.
If you know someone who is handy with a sewing machine you could even offer different themed canopies, (Race car, Space ship, Jets ect)
Too bad you couldnt find and old Fierro seat. they had speakers in the headrest