Hi Chris,
I can see what you have done there and think the quality of the workmanship is great, what I would strongly suggest is to test now, not later. I sort of compare what you have done there as similar to adding in tubs on a Torana (for instance) whereby the chassis twist up to the tubs is nice and linear, then all of a sudden you would see a spike in the graph due to the sudden step change caused by the rigid nature of the tube sections on the tubs. The thing is that you have introduced this change in state in the middle section of your chassis, so I would again suggest test now, that's all.
I love the project though, hopefully once I have finished my own Cobra (not everyone elses'..) I will look to build a chassis for a Daytona and then try and find a good body to wrap around it.
I still have to build another GT40 first so I must be crazy.. LOL
Cheers
Wil