Well, you have made some good progress so far, and I like your design. I don't know about rushing to make a master without the most important steps still ahead. Testing, making that piece of wood or plastic perform as you intend. Ask anyone here about prototype testing, failures, unexpected performance, and "Ah Ha" moments. I wish you the best of luck, but I find making those adjustments easier to do on a pre-production unit. Good Luck,
Douglas