I wish that I had a metric rule handy.
.58 is around 15mm or just below 20 gauge. 20 or 16 bore could be ideal.

The patch box in the stock is just for that: Patches, and extra flint, etc. Nice for looks but not terribly practical.

I have shot one boar, around 90kg ( I had to shoot a boar, its a jeager rifle

) and a number of deer.

A rifle in the 11mm range may be light for some things, as a round ball is not very heavy for its diameter. The larger bore rifles are probably a wiser choice.

I was originally going to install set triggers, but the lock was of good quality and I decided that it wasn't necessary.

At least one folding sight is useful. One for 80m and another for a longer range would work well. That being said, I've only had to use it once.

They do look like they belong in the woods...

Tom