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 I want to make a construction set with rods and nodes similar to Zome or K'nex. Except mine will be in entirely in the plane and based on heptagonal (7-fold) symmetry. (In fact, I'd like Tetradecagonal (14-fold) symmetry, but I'll continue my question with 7.)
I imagine the rods will be fairly easy to make - bamboo skewers cut to certain lengths and stained accordingly to length (probably between about 5 and 15 cm).
The nodes will be heptagonal prisms about 5mm thick and 10mm "diameter" with holes to fit the struts drilled into the (yellow) sides:

I imagine this could be most easily made from a length of wood with heptagonal cross section drilled and then cut up. It could also be made from dowel or pvc pipe.
Question: How to make make a length of wood with heptagonal cross-section? How to drill into the sides?