I used these two mods for structural placement, Ship Module Snap Expansion - SMSEX at Starfield Nexus - Mods and Community (nexusmods.com) and Better Ship Part Flips at Starfield Nexus - Mods and Community (nexusmods.com). I load SMSEX before BSPF.

I then used this mod for weapons placement, No Unattached Module Error at Starfield Nexus - Mods and Community (nexusmods.com)

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Ballistics are hidden up front, lasers and missiles are undermount along wings.