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You can try everything you mentioned. Metal siding would defiantly be a plus (I worked at a farm and garden store to have fielded this question before).
This still doesn't guarantee that the little buggers will stay out. They are remarkably resourceful.
The poisons on the market will kill mice, possibly chipmunks, and rats if you have them, but won't touch the squirrels. Squirrels have a gag reflex and will throw the poison back up.
Naturally traps work, but they are a pain in the ass to set, empty, reset, and at most, you will be effective will population control, not extermination.
Sorry to break it to you, but that's about the best you can do. Limit their access to food stores. Not much you can do about them getting in the feeders except shoot them (hopefully missing the feeder), but outside that, I don't have any additional suggestions.
Well, I have one. A good cat. But cats like birds too.
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