If you are asking what kind of shoes you should build around, I suggest comfortable shoes, especially if you are going to wear it for a long period of time. If you are asking how to build the boots, then you can just google "pepakura halo feet". That will most likely return a unfolded paper model of master chief's feet, and then you can print it out and and then build them, around shoes like you said.
P.S. if you use a paper model you should definitely print on card stock
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P.S. if you use a paper model you should definitely print on card stock
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