What percentage of crew has muskets?
- Player's ships have 30% percentage of crew for muskets
How many preparation points do you gain per round?
- 18 points per round
What is the base musket accuracy? What is the base boarding cannon accuracy? Is there a base melee attack value? Is there a base melee defense value?
There is no exact answer for these questions because the boarding systems use complex formulas including morale drops and morale shocks, and final parameters will depend on commands, upgrades, and other parameters like preparation or morale state and deck difference.
Below I gave an example of two ships without any bonuses.
Alex B.'s post in Boarding stats was marked as the answer