Gundam hangar - Display for Gunpla figures
thingiverse
It's clear that the model is a bit undersized for a 1/144 scale Gundam. A good approach would be to enlarge it by about 10%, possibly even more, to get a better fit. When it comes to mounting the stands for the weapons, you have the freedom to place them wherever suits your design best.
Download Model from thingiverse
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