https://i.imgur.com/AbsJjCh.jpeg

My concern is that those big beams (blue) end where they meet the plywood (yellow). Which means they are transferring their downward force into the board(s) highlighted in green. That in turn presses down on the vertical studs highlighted in red. These aren’t connected to anything on the bottom. So the weight from the beams gets supported by the screws attaching all these pieces to the plywood wall? Maybe if they’re just for looks and not structural support. Maybe that’s how it’s done in germany.

Holy shit, is that load bearing plywood on the far wall (with the rectangle window).

My friend, you need help from someone that knows what they are doing and familiar with local codes before proceeding any further.

I doubt these cameras can sustain that kind of uninterrupted use,

I had an old HTC phone that I used as a garage security camera for 2-3 years straight. It had to be restarted every couple months, but otherwise worked fine. Now you can get a $20 IP camera that surpasses it in every way tho.