personally I'd like to run spoked wheels so I can fit a wider and taller wheel out back.
I never built this due to concerns with the durability of such rings. Maybe the reports of stress cracking all related to stainless steel. I don't know. At least for a time, stainless was a popular choice for this,but it's brittle and not a high-strength steel. A ductile steel, which can dissipate impact and stresses would be a better choice.