How would you guys fix this? Would you cut the whole corner off or something else? Rusty at top of this panel also were trim fits.

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If it was me I'd find a good back of a 240 cut it weld it paint it repair it

I was thinking of doing that. I have an almost rust free complete back end.

    Philthy be alot neater but near enough the same work but longer but will last better

    Yeah cutting a replacement section from another 240 is what I would do as well. Would of course be possible to shape it out of a new flat sheet but that takes a fair bit more skill.