The subject of Aluminium and its Alloys is quite complex and a correctly designed chassis with the correct alloy selection and proven welds may well be feasible but I am convinced that this concept would be beyond the scope of the average amateur in a "shed " environment. The main problem with Aluminium is that it has relatively low fatigue strength and unlike most ferritic steels it does not have an "endurance limit". The endurance limit is the stress at which fatigue failure will never occur.
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