The good news is that if you size sheets, halyards, and other running rigging by what's comfortable to hold, what's not too small to pull on comfortably, and you perforce select blocks to fit, it will all be much much stronger than the actual loading requires.
The place where some err is in the attachments to deck and spars. Anchor things well, through bolting robust pad eyes and such to a backing plate where possible.
G'luck
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