Hi,
I have a suggestion for the custom battles mode.
Basically this is an optional "Treaty" setting. Here you can set maximum tonnage and gun calibre (to reflect the various historical interbellum naval treaties).
It basically only needs a toggle, max tonnage slider and a max calibre slider, maybe per shipstype, maybe just for BB/BC.
The reason for this is so that you can:
1. Make historical ships without getting swatted by some unbalanced AI built megaship.
2. Make it a bit more challenging to create a ship that fits tonnage and guns. This way you have to chose a bit more between speed, armour and guns. Even try to use more modern setups on an older hull (refit ships basically)
Let me know what you think