Ha! If you're judging me by my pic then I had already taken some stuff back apart. I do have a question however. Are you able to hook 2 different gauge wires together; such as a 12 g to a 16g?
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Anything can be done, I have used a sheet metal screw in place of a glass fuse to get home for example. But to your question...
There is basic electrical protocol that should always be followed, that's why NEMA is about a gazillion pages long. Follow that protocol and immediately your project is professional. I'm not saying you need to follow NEMA or any other standard to the letter, but look at how the factory puts things together and you'll get a good picture of how it's done.
So...
Don't mix gauges of conductor (wire) unless it goes through a terminal/fuse/breaker block and is properly overload protected (fuse or breaker).
Keep colors consistent throughout the project.
Solder and shrink tube is always a good idea.
GROUND, GROUND and check your ground. More problems come from bad ground than you can imagine.
Etc., etc...
It's hard to judge from the internet, but you may be in over your head on this project. To save grief or damage, get some help from someone who knows what they are doing or STUDY up on proper electrical procedures/protocol.
GOOD LUCK with your project!!