Use the DMG stats for SF weapons. You don't absolutely need any new SF Skills though I'd be tempted to have Piloting & Engineering skills. Maybe just add an Engineers' Tools proficiency for repairs and have ship AC modified by pilot Dexterity & Proficiency Bonus, ship to-hit based off gunner ranged attack bonus. For space opera, treating space ships as sea ships makes sense - https://media.wizards.com/2018/dnd/downloads/UA_ShipsSea.pdf
Edit: I'd explain magic as psychic powers and treat them interchangeably the way the super hero genre treats everything.
Edit: I'd explain magic as psychic powers and treat them interchangeably the way the super hero genre treats everything.
