Door frame gaps plus jamb & head rebate sizes etc.

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2mm could work for the gaps, but 3mm might offer better weatherproofing. 19mm for the rebates sounds solid, balancing fit and strength. Using timber for stop beads post-installation could be a neat touch.
Thanks very much Glossop Guy for the suggestion of a 3mm gap. That was something I wasn't too sure about. Very helpful.

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