You can see above the successful implementation of the new equipment ingame. Right now, I've only finished the process for the engines, the guns, shields and powerplants still having to be added over the next few days. On this screenshot, I'm pondering whether to add an antimatter drive designed for medium fighters. It's a civilian, AKA pretty bad, one, but it's still an improved version over the standard antimatter drive (AKA one made by Rheinland, which is specialized in M/AM systems). Note on the left side, the yellow area in Cargo Space: the engine takes some room, and some are bulkier than others, so balancing needs and wants will be an important thing as well.
In the above screenshot, you can see the gun store in New London. It's a civilian store, so it has the lowest grade of weapons available, of course, but since it's in Bretonia, its plasma guns are better than foreign equivalents, making it a good place to buy high power close combat weaponry.