Conversion to double garage - brainstorming ideas

So. I took a few pictures. Just ignore that there is still a roof covering on it. It has to be redone anyway, so I would also like to make changes to the garage beforehand.
As for the condition of the garage. The roof actually still looks quite decent and inside everything is dry so far.
Another consideration would be maybe just to "shift" the middle wall a little so that a bigger door fits. I would have to talk to a structural engineer about that. Unfortunately, there are no structural calculations for the garage.

Regards
Martin

#2 still applies, not usable as a garage for larger cars, you cannot open the doors wide enough

Unfortunately, there is no statics available for the garage.

But maybe drawings from the building file. Unfortunately, the pictures did not yet give me the hoped-for insight.

not usable as a garage for larger cars, you don't get the doors open enough

Nonsense. Mine is only twenty centimeters wider, no problem with the Ferrari (355), no problem with the SL (230). And I am neither slim nor exceptionally flexible.