I wouldn't think extending the cab would be a problem. Suggest you use structure similiar to original & tie into the cab structure using ample cross (diagonal) bracing to compensate for a longer shell. Always insulate any of the steel structure from aluminum (outer panels) to prevent electrolysis. To fasten the outer panels to the structure, I would suggest Sikaflex 252 or rivits. I am not impressed with 3M VHB tape.
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