my best advice is that one of the worst things that happen in a garage is that they become damned near unusable if you don't have somewhere else to store what you aren't working on now. I have found that the easy way to do that is that it doesn't cost that much to raise the roof higher and either build a half story section to store parts, or hang heavy duty platforms from the rafters to do the same thing. Here's some pics of my current shop
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