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Although I was berated for it not actually "taking 5 mins", the grid bit didn't take much longer.
Most of that was down to me being overly careful that it was all matched up as I figured they would be a bastard to unlock if I made a mistake.
If we move, or I need to put a big shed up somewhere else I would definitely use them again. idk exactly what they're weigh capacity is, but if you can use them for driveways then I sure it's adequate for a domestic shed.
Still to do;
I will say that these tile grid things are fucking good to put together.