Playing my first run with this mod, and I have a couple of thoughts:
1. Some mod ships aren't for sale anywhere. This could be intended, but for example with Shadowyards, there isn't a single Solidarity Armed Freighter for sale anywhere in my game. I think this might be because these aren't classed as Civilian ships, but they also probably aren't in the military markets either.
2. It would be my preference to see armed freighters in general markets. Is there an option to enable this? I'm thinking ships like the Gemini and Mule, which are absolutely not military ships but can only be bought from pirates or the occasional Persean military market. In my preference, it makes a whole lot of sense for "armed freighters" to be the closest ship available to a military vessel outside of military markets. Since weapons can't be acquired easily, lore wise an armed freighter might not actually have any weapons mounted.
3. Is there an option to allow PD guns in open markets? Along with #2, I feel pretty comfortable that putting anti-missile defenses on freighters would be allowed even under extremely strict arms control.
4. For Nexerelin starts with a trading fleet, it might make sense to restrict the ship options available. I can start out with the above mentioned Solidarity Armed Freighter with a full weapon loadout, making my fleet one of the most heavily armed small shipping operations in the sector, right from the start.
5. If weapons are highly regulated, should faction patrols take offense to your ships having guns mounted? Or is is it one of those situations where use is tolerated but not sale? I can't really think of a good way to handle this that is both gameplay friendly and honors the intent of this mod, but maybe you can!
Overall it's refreshing at least on my first run to not be jumping straight into a military fleet. Pirates are less dangerous in general from what I've seen, which means a few armed freighters really would be able to hold their own... if I could only find some armed freighters...