A couple comments....
I liked the first Black Widow logo.... the one with the geometric web behind it.... Start working with some artistic types to create a cool Marquee/side art that has a font similar to the geometric shape and uses the logo for the O in Widowmaker.
As for the seats, I see nothing wrong with the Supra seats, but as your going to do a leather center console and are striving to make the rest of the cab look beautiful, these are going to stick out like a sore thumb. Take them to an auto upholsterer and have them covered in the same type of leather as the center console with silver pinstriping on the seams, then have the logo stitched into the headrests.
You didn't mention it, but are you making the seats adjustable for different heighths? Just need the tracks that the seats mounted to.
All black will look too plain, so plan on some pinstriping or something. Hell, hire an auto pinstriper to come to the house and do it. Maybe pick proper color-shades and get some black light or neon around it to spiff it up.
And for splitting screens, dedicated twin racers or twin shooters (like Time Crisis III) have separate CPU's and hard drives and play together through a router. Doubt you're going to be able to split the signals to two screens without having some playability issues on the shooters, or visibilty comfort with the racers using only one console's CPU.
But... I've got relatives in Lincoln, so if you ever get it done, throw an "unveiling" party, fire up the grill and show it off. I'm coming up there in August anyway...