To allow cross sectional strength to the steel subframe, and provide a base for the aluminium side walls, an aluminium ladder is mounted between the steel rails.
Two rungs are then removed to make driver seating space into the floor pan area to be created later.
A steel threaded rod is passed through the rails and the remaining rungs to tie the sections together-
with a square section of dowel drilled to act as bushes to prevent metal to metal vibration. These are epoxied in
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