I'm not sure the source of your panels, but I saw a patched version (Rimmer?) when I was living in the UK and it didn't look bad - I suspect there is a bunch of mandatory tweaking involved to get everything to match up nicely.
Just curious, but I see dents but no rust on those snapshots - is it impossible to repair what you have in hand without the patching, or at least cut out smaller patches using the repair panel as a start?
Randy