Thule Legacy uses the "R.U.N.E" hull mod which is faction only. The code was provided by Lazywizard
The hullmod itself is an almost instant in-fight repair system for weapons and engine.
A shieldless faction has enourmes issues with balance, as the combat is based on shields and the involved mechanics you will have a hard time.
I chose the repairsystem because early tests showrd other ships could easly render any Thule Legacy ship useless just by disabling their weapons.
Characteristics that could counter the lack of shields.
a repairsystem for weapons and engines
increased mobility
an in-combat hull repair system, look up the shadow order
a mix between very slow firing weapons and a high flux capacity
good luck to you