Box Launchers can only be reloaded by Maintenance Facilities or in a Hangar. In turn they are incredibly small.
Fighters will probably operate from a Hangar.
As for Sensors, you might just add a Sensor Fighter that gives sight.
I don't know how you get that high maintenance on your fighters, I'd say a small craft engineering space is the biggest I would ever put on a fighter, maybe one fails some time, but they are cheap and disposable.
Also, that high Fuel capacity isn't at all necessary, they are meant for medium ranges.
For Armor, I'd go for 3 if you intend it to survive a direct hit, that'll stop WH4 missiles and 10cm lasers.
However, maybe ecm or more speed might prove a better protection.
Also, the S4 missile has 48 WH, at 49, it would penetrate an other level of armor.