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Just wondering if you can heat up the after market resin parts
You can heat them gently using boiling/real hot water or a hair dryer. Which works best depends uopon exactly what resin is being used and they are not all the same!
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and bend it to the shape you want?
No, you can't. Polyurethane resins are thermoset resins and, while they will soften somewhat with heat and can be moved a bit (like straightening warped parts) they are not thermoplastic, like polystyrene kits, and will not take radically different shapes with the application of heat.
A thermoplastic armoured skirt can be turned into an airplane cowling, with heat and the right mould. A resin armoured skirt can not.
Paul