Fellow skoolies, IMO
This roof raise using wood is why I recommend NOT buying a bus that was already modified / converted. Your buying someone else's mistakes.
I would cut that apart and fix it. However in reality where they cut it, there is no fixing it. That is right at the curve point, no room to splice onto the support ribs.
A different bus would be my approach. That one is fit for storage that never moves.
Having said all that, Do what you need to with your budget to get by.
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization