Hey Hobbit,
When you say single Pot RDWC, do you mean one flower tub and a control tub?
But as far as pipe diameter goes for the returns, it depends on your pump size,
personally I have used 50mm return pipe and 2 returns per tub (I have 4 flower tubs) this is for several reasons, you can look up water flow in different pipe diameters, remember the returns are under no real pressure so you need to check at standard pressure/gravity
Also having multiple returns from the tub stops all the water leaving the tub in one place, creating a current and sucking the roots through the pipes.
Another reason for bigger diameter pipe is also to stop this pressure/current or at least equalise it with the flower tub.
Also flexible hose is bad, for returns at least. the water flow rate can be very low through it, especially with no pump.
Hope that helps some.
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