I'm only guessing, but being very knowledgeable of Dune Buggys my guess is the REAR of the seat needs to be moved back. The "T-Buggys" moved the controls back and the seat was in the Volkswagens back seat area. My guess is that AMT used the Manx chassis without moving the controls, and butchered the body to fit, leaving the seat to far forward. BTW, I'm a rivet counter too.