Welcome to the forum, the only thing with making the chassis longer is the side panels will have to be custom made in ali. I have made a chassis for a member on here who wanted a chassis made 50mm longer,although you could make it even longer. It's easy enough to do just add 50mm+ to BR5+6? (the square where the seat goes?), TR 3+4 and adjust the length of D3+4 and the tranny tunnel to suit the numbers of which escape me at the moment.
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