It's finished! Thank you for all the likes on the progress updates! Thanks to you, I was able to stay motivated while working on it.

The kits I used are as follows:

[Base] Lord Astray Omega
[Shoulders] Lord Astray Double Rebake (shoulder armor) / Double Rebake Rifle (weapon)
[Arms] Lord Astray Double Rebake (white armor) / Mighty Strike Freedom (anklet armor and shield) / Astray Red Frame (wrist)

[Completed] Rex Astray [Duel] HG 1/144 Lord Astray Ω Modified | xiao's Gunpla works