The Mustang I built used 2"x4" crossmembers similar to the Morrison chassis. I ended up moving the seat way back, bringing the steering column back as well. This makes the drivers stretch out, and set pretty up right.
The perimeter chassis I did in my AMX used 2"x2" crossmembers anywhere the driver/passenger was, this allowed me to keep the seats in the normal location.
I think Morrison will build you anything you want, their normal chassis, a perimeter chassis, or any thing you can dream up. Speed Tech stuff looks very well built also. Detroit Speed is also a great choice, quality built, by great people. What you need to do is figure out exactly what you want, make some calls, and see who can give you that chassis.
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