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Maybe you can smooth out the interior edges by filling the seems with a bead of epoxy or by glassing in some foam. I would start with nothing and develop a fix from there if needed.
My hats off to you for taking on a project like this.
Find: Flow rate of water through square tube Given: Cross-sectional wall and area of square tube, A=w^2 Length of square tube, L Pressure at start, P1 Pressure at finish, P2 Water *** If you need specifics I am pushing water (room temp) at 1 bar through 1200mm of square tube that...