Been there. Considered some structural mods, turns out cases are one of the few things that aren't miserably overpriced yet.
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Just remember, measure twice, cut once.
Or keep cutting until it's long enough!
- Red Green
If you get everything out if those 3.5” / 5.25” bays you might just be able to do a clever rotation to get the card into place
Depending on the case the bays can be removable. I had to take mine out to my GPU.
Buuuut if the GPU doesn’t fit in the case length wise these massive ass GPUs probably won’t fit height wise either. My 12vhpwr cable is making an uncomfortable ass turn with the side panel on. And it seems like every angled adapter is more house fire than the last so I’ve held off on adapters.
I had the same problem not too long ago. I just bought a PCI-E extender and have the card sitting outside the case.
This should be marked NSFW before an admin sees it uou heathen
I still have an AMD 7970 laying around with a cutoff shroud for this reason.

I was young and wanted to play...