Hi there from Portugal,
I’ve been making one of these babies. Thanks for sharing!
For V2, if U choose going with 3 conduits, there’s a study:
2m 25mm*1.5mm pipe aisi304L (SS)
20kg force at middle point
Note that, when spacing the pipes, the displacement at the center lowers. In the examples, one are all ‘together’ and the other 40mm apart.