Such notches are usually done by hand with very sharp chisels and not milling machine, also because you have to prepare the other part of the connection also, at the lower deck clamps - father and mother have to fit well
Today I can show the lower level or floor of the powder magazine which was located between mizzen and main mast.
You can find the location at the following longitudinal section of the ship, marked with the red circle
The details of the powder room were constructed (designed) based on a publication showing a contemporary model with all shelves, doors etc
For comparison you can find already some elements of the shelves....
This is the lower level / floor of the magazin, which will be installed in the hold
On the backside wall you can see the cabinet or oriel with glass windows in which from outside the lamps were given.
In this way the dangerous fire was separated from the explosive powder
Here the backside wall with the different doors and openings - this access was from the bread-room
Many Thanks for the interest ..... to be continued ......