Hi RnR I do not know all the answers, but if the sills are rusted badly and/or you cut them out for replacement then you must structually support the body in reasonable alignment. It gets pretty floppy as it is a monoque construction relying on the sills and box sections for strength.Michael. I too am to embark on a sill repair. My TA was bought complete however the sill and floor is severely rusted. Please advise if the sill sections were bought ready made. From whom did you get them? It appears from the photos that the sill came as three parts. Did you join all three then attach to the car or insert the pieces separately. Is the car body stable when the sill is cut away or do you require structural support to prevent warping?RnR