C30 tall rig: "I" (masthead to deck) 43.00; "J" bottom of foretriangle (13.16; "P" (luff length of main) 37.00; "E" (foot of main)12.00. Your boom is a little longer than "E", and the mast is a little shorter (height of cabin top to deck) than "I". This will give a pretty good idea of measurements, though.
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