Asteroid as a generation ship

I was wondering if it would make sense to hollow out an asteroid to use for a generation ship? Also, might it be a good idea to use hollow asteroids for any kind of long distance space ship? I'm thinking you can mount engines on the outside, you have some great hull protection, there may be some handy ready resources, it would work for insulation so less energy would be needed to keep things habitable, and going at high speeds small objects would pose a much smaller risk to the integrity of the ship. So other than mass, are there any other big drawbacks?

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Asteroid as a generation ship

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