Some are a work-in-progress, and some are essentially complete.
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I don't have an engineering degree, and I will probably set my house on fire by building all this stuff.
So, if you choose to follow any instructions, or use any content from this site, you do so completely at your own risk.
However, if you choose to experiment and learn, I'll gladly take credit for teaching you something new! (But I might be wrong, so verify everything on Wikipedia — which might also be wrong!)