The problem with any other profile than angle is attaching the panels. Angle gives a nice inside edge to glue them to and then run that same glue around the outer panel / angle joint to seal it. Round in particular provides a number of issues in that regard. Round would be great for stretching tent material around but not flat panels. My problem is in sourcing the size of angle I'd want. I can get 20x20x1.5 stamped but doubt it'd be strong enough but the next size up is 16x16x3 which adds 10kg or so. I did find one supplier of 15x15x2 in stainless only though and a whopping price - enough to be too much. 2mm angle appears largely the preserve of aluminium so maybe I need to try some aluminium soldering as it'd save 13-14 kg over the 16x16x3 steel. It's only supporting it's own weight so not a critical failure point.
The design above has a 90 degree bend in the steering. Perhaps I'm missing something and more detailed plans explain it. I see a few were built on the wooden ones you linked though. I see the issue with an overly wide track you mentioned in many of those too. The body on mine is barely wider than me with the tapered front.
The design above has a 90 degree bend in the steering. Perhaps I'm missing something and more detailed plans explain it. I see a few were built on the wooden ones you linked though. I see the issue with an overly wide track you mentioned in many of those too. The body on mine is barely wider than me with the tapered front.