Single width (SW) towers are 850mm wide, Double width (DW) towers are 1450mm wide
Span frames are the ones without the ladders. Ladder frames (rather obviously!) have ladders in them
Red Braces are Horizontals (1.8m or 2.5m)
Blue Braces are Diagonals (2.1m or 2.7m)
Frame sizes - 4 rung frames are 2m high, 3 rung frames are 1.5m high, 2 rung frames are 1m high (approx)
Fixed decks are the ones without the trapdoor / hatch
