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Improvise if and as you have to. For drawings like this, I'd tape paper to a plywood or Masonite backing and then secure it to the mast with a couple of spring clamps.
Do WHATEVER you have to, to avoid crouching. If not boxes and bricks, then stack books or magazines to raise your surface or your subject. It's hard enough to return to the same spot and posture for measuring, without going through contortions (which will completely frustrate your attempts to measure accurately.)
Good luck.
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