This is something that has been discussed many times before but may not be in a thread by itself and it's hard to find all the input from others. I looked quickly and couldn't find any discussion.
I myself added a tab for mounting the fuse box instead of using the clamps (that may have changed now). I added to tabs on the rear tube 7" apart to mount a license plate. I ground off the engine cover tabs since we weren't going to use them. Some have welded bent washers to the frame to zip tie down harnesses, etc.
Watch the videos and think of things that you might want to do differently. Many customize the build to suit themselves, so it's going to vary from build to build.