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I was in your place a year ago so I'll give you some solid advice: Download meshmixer or NetFabb basic, both for free, and start learning how to chop up meshes for yourself. It will save you tons of time from having to ask people if stuff fits on your printer, and lets you chop stuff of up the way you desire instead of being dependent on other's takes on a chop.

Offhand I think you'll have some trouble with that small a build area and most masks or helmets unless they're ready-made for print on that small a machine. But, you can easily chop up the existing parts one more time each to make it all doable on your machine.