These parts assumes, to use 40x40mm square tubes with a thickness of 3.5mm and UHMWPE-pads with a thickness of 4mm.
Preferably it would be a better choice, to take 40x40x3 or 40x40x4 because these profiles more widely available. UHMWPE profiles can be adjusted by manufacterers.
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Total quantity for AL tube 40x40x3,5 = 0,8 m + leakage for sawing