Well after recieving some info from
agra on the eq2 beta forums
/loadui is the command.
Now the UI folder in the EQII folder is where you make your custom folder. For every custom folder you MUST have
eq2ui_skininfo.xml in it. You need to edit it and put your skin name, version, author, webpage, etc into it.
I made a custom folder and copied insom's player window and a eq2ui_skininfo.xml and sure enough it showed up on the /loadui menu. I then loaded it however the stats in insom's player window did not work, it only showed the genaric numbers for the hp / power stats. Maybe with this info some of you people can figure out why.
I'm guessing a few other files need to be in that custom folder. It doesnt look like the graphics need to be in there becuase the graphics loaded from the default folder just fine.
Warning... after using /loadui more then once you will crash the next time you use it if you dont shut down EQII and start it back up.