I don't know the answer, would guess 1.5mm, but will try and find out when I'm down collecting my bodywork in the next few weeks, as I'm also curious.
If I were to place a bet on weak points, I'd opt for the joint between the upper logitudinal box tube and the rear bulkhead, closely followed by the lower joint which to try and describe easily, I'll call the base of the A-pillar.
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