Hi Gary I imputed your numbers into figure XP and if you have a fixed light source like texereaux then It's looking good. Punch in your figures when you can it's not complicated and try the different buttons. Acoording to the program you have a 1/6 wave mirror give or take a little. I would be inclined to try for 1/10 . It just needs a little more tweaking and you will be ready. The outer zone is always a bugger to get. Redo the measurements a couple of times before attempting to figure the mirror again. Try 5 or seven instead of 3 also a very little bit of light (not total darkness)ay help when you are testing the outer zones. Some commercial mirrors sold as 1/4 wave don't look as good as this.Keep going. If you have any problems I'll be home after 6 tonight and online after 6.30 If you need any more help specially understanding some of the details of Figure XP.
Regards Cristian