Although the answer to to post topic was in Post 3 (the answer is ‘You can’t set Level 0 size of a Hex-dominant mesh, although it is on the feature request list’)
I was able to get my mesh to work using a Hex parametric mesh to appear as you see below:
I will leave it to the coders and mathematicians to figure out why this Feature Trick made my ‘eye’ shaped BMB and geometry appear, but it did…