Thanks. My first ATR instruments should be posted in a couple of days.
I asked a similar question not long ago.
viewtopic.php?f=14&t=62
I've been learning by ripping apart others instruments and building a resource folder of my own. Actually right now I am trying to re-code your awesome 737 MCP into a more generic MCP that can be used with other aircraft. I hope that's OK.
PS, it's not an easy task but a huge learning curve.