So after seeing Stern's latest release (WWE wrestling), and seeing their minimalist wireform ramps (not 4 wire cages):
I've decided I'm not even going to bother with plastic ramps. If Stern can build a commercial pinball with minimal ball support, I don't see why my homebrew project can't. I was trying to find the best solution, I know Ben heck used brass rod. I looked at copper coated low carbon steel, I even looked into solid copper, but copper is very soft. The zinc in brass hardens it up, but keeps it soft enough to form easily. I was going to order a brass wire spool, but realized it would be a nightmare to straighten out, so I opted to order 5 pieces of 3foot length brass from mcmaster. It ends up being about $1.05/foot. Brass is quite solderable because of it's high copper content. So long as I can clamps pieces together, all it takes is a small butane torch, some flux, and solder, and you can build very strong wireform structures.
I may toss in a VUK or two, which will need to be cages for sure, and I'll need a way to fabricate those as well.