Here are some observations for Step 4 of the "platform" or construction frame.
Parts A 15 and B16 are not marked with part numbers on the wood parts, but they are pretty obvious.
Parts A-16 and A-17 are marked adjacent to the parts and lose their identification once you remove them from the wood board. Write on them with pencil to identify them.
Parts B-16, 1, 2 and 3 are actually identified as parts B-17a, B-17b and B-17c (2 of each).
Parts A 15 and B16 are not marked with part numbers on the wood parts, but they are pretty obvious.
Parts A-16 and A-17 are marked adjacent to the parts and lose their identification once you remove them from the wood board. Write on them with pencil to identify them.
Parts B-16, 1, 2 and 3 are actually identified as parts B-17a, B-17b and B-17c (2 of each).