I won't need an alternator as the races are about 10 mins long and I'll plug in to a slave battery between races and use a jump starter for starting, this kept the engine tight to the roll bar and the lower control arms into a bushing in the 40mm box connecting the bottoms of the roll bar.
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Once I was happy with the rear end I set about designing the frame, I bought a Kirkey seat, got a Van Demien steering rack on ebay, a steering wheel on AliExpress and set up everything to get dimensions. I was aiming to be in the middle of the min max dimensions in the regs and keep everything as light and stiff as possible.
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I used SketchUp to design a simple single line frame and then I used an extension in sketchup (DBS pipe tube profiles 2020) to convert this to a tube frame. I used 27mm mild steel tube 2mm wall.
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