Using the HG White Gundam and the HGUC G-Armor, I'll try to make a Sieg Axe version of the G-Armor without any modifications. *I'll use this pose a lot because it looks good, but deep down I think this pose doesn't suit anything other than SEED (especially the Universal Century) lol. I'll get another shield by ordering parts (I absolutely need two shields to recreate the G-Armor). If you're ordering parts for the Red Gundam expansion set (and you don't plan to buy it), you can also order the bazooka parts at the same time so you can make a two-handed bazooka. Of course, the Gundam Sky will also be unmodified.

Zeke Axe version G-Armor (tentative) | こなゆき's Gunpla works