Zipper Kart moves foreward

Well , this has been a long haul to say the least ,but I've made some progress . I was offered a complete Kart which I broke down into parts as a donor Kart . I used the Driver , fuel tank , side pods & nassau & seat to flesh out my Kart . I need to restore the pods & nose as they are split from zip ties . I'll be bolting these on properly - no more zip ties . I'm redesigning the rear bumper to shorten the space from the chassis end to the outer face of the rear bumper as it looks too long . The chassis tube ends on a real Kart terminate just past the rear axle carriers ,but I dont want to cut this frame - which would be the easy option . I have tracked down more spares and so I'll be getting new gloves & suit as this one has some fuel staining and some new pods and nassau - possibly wheels , but I'm in the process of getting these re-chromed. I've fab'd up a proper exhaust mount as the original one is just a bit of wire that flaps around ,and some proper seat support stays . I've fitted a Force pull starter to the Force engine as the roto-start fitting I put on it was now obscured by the side pod . Once I've finished to 'graft' I'll restore the whole thing and probably colour the chassis frame