Cool idea! When it comes to Gundams, scale is everything. Consider this: the average scale of a mobile suit to its pilot means that the pilot is about the same height, standing up, as the head of the mobile suit.
1/144 th Gundams are approximately 5 inches (12 centimeters) tall, on average, and in 1/100 th are about 8 inches tall. I can't see the picture you posted, so you'll have to tell me which scale will work.
For reference, check out the Gundam wiki.
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