I love mine. I can't believe how much lighter it is than with M/S. The only down side is the expense, so try to minimize mistakes.
FYI, I'm building mine to 25.4B specs. Mild steel is definitely acceptable with full specs under Section II Basic Construction Practices, SFI 25.4B Material List, and SFI 25.4B Tube Size Color Chart.

full chassis 2.JPG