^ Of course this is the response you get...
A purpose built tube chassis car is essential just a web of what we consider chassis braces on an oem car. All cars flex and bend in the same ways and you can fix that a little by connecting certain existing bolt holes together.
Same concept as roll cages. All cages have the same basic design with a few edits to fit the specific car. Would you think a car body is "tested for weakness" by a cage builder?
Maybe the fiesta analogy was a bit more than what most people want to hear, but the concept and facts about chassis reinforcement is legit.
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-'13 Subaru BRZ Limited, SWP. (Mods: Driveway Labs full aero, MCA, etc)
-'06 Mitsubishi Eclipse 3.8L, UV blue. (Mods: turbocharged, full suspension, too much to list)
-'13 Town and Country Limited (Mods: too many kids)