You can certainly use rivets to hold parts together. The biggest issue is not the size of the rivets (since they come in a wide range of sizes) but rather that rivets are permanent. If you ever needed to dismantle your saber to repair your internal electronics, the rivets will be a major hindrance.
Rivets are fine for an empty belt-hanger. Not so ideal for a saber with electronics. Sooner or later, you'll need/want to dismantle your saber for some reason.
My first saber (see my sig pic) is held together with rivets. I'll give you one guess why I've never gone back and added electronics to it.
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