I've seen @Classtime's garage, it's probably too tight for what I did when we moved, but maybe you can get an idea from it. Mine is on wheels:
a few 4x4's, some scrap plywood, caster wheels and some pipe
aluminum 1x2 channel. Works for horizonal dropouts only, but I've got a lot of them.
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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.