Rebuilding form frames for aft cabin

When I first started this project Ian Farrier had not yet published the aft cabin version and I cut the form frames to the standard cabin aft cockpit model. So I had to modify two of the form frames to get the aft cabin in. I just made an extra piece of MDF and fixed it to the original form frame with another piece of MDF and screws.

Then mounted it as the others:

And here both modified form frames (and all the other ones) on the strong back:

I need to brace up several more of the form frames in addition to the two already braced in order to get everything perfectly straight and steady.