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@Emyr
Timber & PIR numbers are likely to be optimistic, based on the performance in the middle of a sheet with no metal screws inserted. Every stud is a reduction in insulation thickness. On the other hand, the metal window frames are probably a bigger problem in terms of heat.
A single SIP is probably about 50kg, so ease of build without a crane depends on how close to the delivery truck can drop them. Having all the openings already formed to the correct sizes is nice to avoid too much faffing with shimming frames. I've seen projects where the manufacturer basically did first fix before delivery, though that's less helpful for a shed. At 3.6 x 5 with a mostly-glass fourth wall, there'd probably be less than 20 pieces to make the entire shell.