i agree, a normal ladder frame chassis will twist a lot more than a sheetmetal uni-body, now if a true cage is engineered into the same ladder chassis, then if designed correctly, will be more rigid than the uni-body even with sfc's.
but, i would be willing to bet that the ladder chassis and cage with alum "tin" will weigh in about the same as the uni-body with sfc's and a minimal cage, now for a street car, i would lean hard towards replacing the floor pans and adding sfc's, unless cubic dollars arent an issue.
comparing it to the FFR chassis, it is designed basically as a place to install drivetrain/suspension, and hang a body.... without a roof to "truss" it all together. so in reality, this is like comparing apples, oranges and grapes.
i have a "ladder"frame/cage in my 34 ford RACE truck project, a 64 1/2 unibody/sfc STREET CAR mustang, and also a super EXOTIC full round tube chassis cobra with viper suspension, each of them was designed/modified for a specific purpose with what i thought the vehicle was realistically gonna be subjected to....each design has its pro's and con's, and it really just comes down to the best overall design that fits your specific needs and budget.
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