Hi, The Mini Master did indeed have a tapered wing.

The fuselage was similar to the Trainermaster but slightly different.

The size was for a .25 or smaller.

Here's a couple of pictures of one of the ones I had.
This one was the first production Mini.
This was also the one used in the construction photos.

The one on the cover of the box was a pre production one.
It had a built up wing with no sheeting.

Last picture is a Trainermaster and a Mini.