[rambambram]

I love the Kee Klamp system (or just 'steigerbuis' as we call it here in NL). I built furniture with it in the past, and also a bicycle caravan (https://www.theredpanther.org).

[sitkack]

If you have a hood welding hood with forced air, EMT is fairly easy to weld with a gas shielded MIG welder. Makes very rigid structures.