How solid do you need? Enough to convince General Dynamics bean counters? It's solid enough for smaller risk takers to take action.I agree with your opinion that Elio modifications of nearly all types (including gauge cluster replacements) will have a viable market. It's just that this poll does not provide any solid evidence to support or refute that conclusion.
I realize it's math you are addressing. But, just MHO, this is the aftermarket business that is more applicable. Little bit of black magic involved in that.
But we each have our own line of reasoning. I respect what you've said.