Is construction power worth it because it is cheaper? Experiences?

or to connect the high voltage to the existing meter?

Currently, there is only protection against 16A

The 16A are only the circuit breakers against consumers after the meter. What kind of fuse is present opposite the grid feed point? That is, between the utility provider and the meter?

The 16A are only the RCDs for the consumers after the meter. What kind of fuse is present opposite the grid feed-in point? That is, between the energy supplier and the meter?

Good question! I'll ask about that. Maybe 32A are already possible.