The major axis is 6" and the minor is 4".
I have a pretty full set of guides and can get a extra one if you suggest something I don't have.
I have drawn the project and have worked out the various points that need to be covered.
(a) The size of the template cut-out to produce the rebate for the mirror.
(b) The size of the templates recommended
(c) The cutters required
I would suggest the method I would use and that is to make two identical templates and sandwich the material between them. The material should be held secure in the 'Jig Holder' I have been talking about for some time. One of the templates can also be used as the Jig to hold the material. How you are going to hold it secure will be up to you. Keeping it larger than required would do as that is what I would do.
The size of the elliptical cut out should be 6.59" major axis and 4.54" minor axis. (This could be made slightly larger both ways again this will depend on what cutters you are using)
With a fine beading cutter I would rout into the face of the material this would eventually be the beading on the inside of the frame.
I would then flip over the complete set-up and then with a straight cutter rout the rebate for the mirror stopping at the beading put in from the other side. All of the operations will depend on what template guides you are to use. The drawing shows 1.18" using the beading cutter and .84" using the cutter for the rebate which shows .24" though it could be slightly larger.
I started drawing this using imperial measurements but I quickly changed to metric the simply got the program to convert to imperial. Now I am convinced why the template guide method is not popular in the USA.
At this atage Bob i have not gone into the method I would use to rout the external shape of the frame and putting on a moulding I will wait to see if you wish to proceed with what I have put up now. I have made such frames and I have included pics of the results. Maybe others will come up with a better method. At least what I have suggested does work as I have produced the goods before and I would not attempt to suggest a method if I had never had success with it.
I await you comments