Since there isn't one up already, I decided make a thread here with some tips and suggestions that I come across when building a custom quadrotor from scratch.
Anyone else who has a few tips or suggestions to building custom quadrotors, feel free to post!
I'll start with:
Don't use all-thread, also known as threaded rod, to keep your hub structure together. It's evil!
If you do end up using this in your design, be prepared to spend hours of taking it apart and puting it back together. 90% of that time will be in moving the nuts around on the all-threads.