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Sofubi Damashii had been traditionally done for Kaijuus and Tokusatsu heroes.
Even the angels were to scale with the Tamashii Spec Evas.
Gundam ANIME styled giant MAs will look pretty Kaijuu anyway.
I will start spamming Sofubi MAs when the Sofubi Raijuu comes out.
A 1/144 Bigzam should be 41cm, which is definitely doable and kept below 20-25k yen.
Most Sofubi are either static or semi static with a swivel joint for the limbs.