Rear Chassis repair advice please..

[Q plate]

Hi all Im repairing the rear chassis at the moment the photo shows the section cut out but I've actually plated this now Flush if that makes sense in line with the rest of the chassis section. I know that there's also a 2nd strenghtening plate in this area.. the inner face of this rail is in good order so I plan to leave as is.. my question is I plan to fit the re-inforcing repair section over the top next, do I need to cut out the inner section (of the repair panel) as the chassis rail already has the extra skin there intact. I know It would only be an extra plate of a 1mm or so on top but I'm sure I read here about getting this area as accurate/original as possible as it may affect geometry and re-fitting of the rear suspension etc what you think?

 

[JdeW]

The preparation looks good, but you don't need expensive repair parts.
Buy some zincore sheet metal of the right thickness, make a template and make a inner fitting piece from the sheet metal, drill the holes, thighten the fitted piece with the nuts and bolts and butt weld it in place. Then make the second (the reinforcement) plate and plug and seam weld it.
Don't worry to much about the geometry as that hasn't been affected.
Browse in this site https://renault4.weebly.com/projecten.html and look for the same repairs you are doing.

 

[JdeW]

You may look at some chassis repair and welding which I performed on my R4 GTL.
For keeping the exact dimensions and geometry you need a small jig as seen from here https://www.renault4.co.uk/forum/threads/r4-gtl-1985-restoration.8252/post-57497
And from this point onward https://www.renault4.co.uk/forum/threads/r4-gtl-1985-restoration.8252/post-59369 you see how I repaired the front chassis beam with inner and outer pieces.

 

[Q plate]

Excellent many thanks