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I choose 800mmx800mmx400mm Which gives you a working area of arround 500x500x200mm.
I bought 2x1.2m and 4x1m which gives you everything you need. (even 4x 200mm for the feet)
(Also cheaper than 6x1m - I have calculated everything)

BTW: ALL conduits have the same dimension (25mm OD in this case)