After looking at the commercial offerings, I am currently working on a DIY solution as documented by @72bluNblu and other FABO members - example: Best Subframe Connectors
I like those too. If the torque boxes are framed in it should work as good as any I would think. It seems that these cars just need a little bit more strength from front of rear spring to backside of front frame member. Not too ground breaking but they need something. If I started over I would be going that route, much cheaper and not all that hard to build. I do admit I'm not the best welder but if I hide my welds under the car seems like a good place to practice.
