I didn't even really consider holes since my goal was to prove an idea I had of using "lincoln log joints" with "impact-tightened constrictor knot lashing". I'm put quotes around those terms since I made them up.
If I did use holes though, assuming I kept the lincoln log joints as well, then I reckon that would weaken the joints too much, e.g. crack the pipe on hard impacts. Also all the weight of all the bolts would add up quick. Hmm I suppose I could use plastic bolts of some kind, but then they'd have to be thicker, thus making the holes bigger, thus weakening structure further. Just thinking out loud. There could be a way, but yea I was proving the lashing concept first and foremost.
You're giving me some ideas for what to do with a bunch of bamboo I have overgrowing my area. "Standard" methods for dealing with wood cylinders aren't very strong or convenient so I'm seeing from your work how traditional asian construction arrived at lashings. Bamboo is so strong and light, it's a shame not to use more around the house.