Looking good! I have one advice and one request you can probably agree with.
First of all,make the plane start with historical armament,as far as I can tell its going to be 70s or 80s plane so it should have either AIM-9P or Ls.Current F-5 on Iran mod has AIM-9X's pretty inaccurate,also make the pylons compatible with weapons from other mods such as Firewill,SOG PF (not a DLC but it has unique weapons) and lastly SABs.
And lastly request,Turkey used F-5s heavily.
First one with grey camo
https://www.the-northrop-f-5-enthusiast-page.info/Pictures/Turkey/3067.jpg
Turkish Air Force initially operated F-5s with grey camo pattern but due to NATO's standart camouflage pattern it got changed into multi camo (ish) pattern
https://www.the-northrop-f-5-enthusiast-page.info/Pictures/Turkey/5-199Eindhoven.jpg
Looking forward to this mod as F-5s are great planes and historical pieces which Arma must have.