Ok, since you said I should try and fix this situation. I probably need to first make my disk 1 part of the array without a rebuild, is this even possible ?
From the diagnostics my disk5 doesn't look too great but it can be accessed now, so I'm not sure about this and getting everything running again.
I also want to start from scratch, but keep all my data as far as I can, I'm sitting with a mess. From my drives 1 reports as not installed and another reports as "unmountable: no file system".