Sure!
Yes, The parts will be be NFTs that player can purcahse and trade with each other.
A mech will require the following parts: Head, torso, 2 Hands, 2 Legs; after having all the parts the players could then use these parts to build their own Mech.
Every part will have a special ability, and two players could battle each other's mechs, either for fun or betting on other parts.
Since this is blockchain and everything is open source, players could create their own implementation of battles and games to use the mechas in.

I hope this answers your question.
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