I have always been a fan of the Slayer. And in your Era range the SL-15R.
6(9), lots of Armor, lots of Fuel, LB-10-X, Lots of Medium Lasers, decent bomb load. The Medium Lasers Should be easily swapable with Clan Salvage if you fight them, and the LB-X can be swapped with Clan LB-X, Gauss Rifles or ER-PPC, with extra room for more ammo. Existing variants also allow swapping the nose mounted Autocannon with Missiles, so that variant could be replicated with Salvage as well.
320 Engines are common, Medium Lasers are common and easily upgraded in your time period, Standard Heat Sinks are common and easily upgraded in your time period. Production occurs in multiple factories in multiple realms, and precursor designs are common on the Merc market, so you have supplies, replacement parts from multiple sources. The only AdvTech upgrade is the LB-X, everything else is SW tech. It's also basically a Flagship design for the Kuritans, the OA has them and makes them as well.
By no means optimized, but a good trooper design that can fulfill multiple roles, and a design that is easily tweaked and modified for different weapons and roles, From Air Superiority, fighter Bomber, Dropship Popper, and Strafing.
It is like the Thunderbolt of ASFs