Longer range fuel tank(s)

[AshG]

completely different rear end design though mark. on the striker the wishbones mount to the triangular frame which supports the back of the car and the diff hangs off the seat back rails. on the roadster the rearbox that supports the rear weight of the car hangs off the same spot on the seat back rails as the diff. d12 and d13 spread the weight up to the upper seat back rail and the suspension turrets taking some of the strain off the lower seat back rails.

horses for courses but if d13 wasnt needed it wouldnt be there simples as that.

btw haynes validate all the designs before going to print so its been well scrutinised for strength. the single seater is already on its third revision due to input from haynes

i dont disagree with you mark the striker chassis as a proper bit of kit but its pushing the boundary and is a bit risky for an inexperienced home build, the roadster was designed for home build and as such was well over engineered to compensate for poor welding and construction.