I'm not even going to do my usual pre-post search on this one, because I'm probably just crazy, but:
If I stuff an eight-pound weight inside my acoustic, will it feel like a metal resonator on my lap?
Next question: what can I feed through the sound hole to accomplish this? Eight 16-oz bottles of water? Holy crap, that image just made me realise how heavy a metal reso is!
The potentially-sacrificial acoustic for this experiment is a The Loar LO-16, which I'm guessing weighs three-to-four pounds, so adding eight pounds would probably result in something on the heavier resonator side, at 11-12 pounds.
Obviously, I could just go out and play a metal resonator in a store, but I need to feel (assuming I can still feel) what it's like after an hour or two, and the salesperson might think that's weird, especially if I need them to pick me up and put me in my car seat after I'm done playing.