I like the design I've seen so far--neat!  I don't really know much
about coats of arms, so I won't try to add anything about the
design.  One thing, though, that crossed my mind: When it comes
time to put the motto on the coat of arms (or any time it's used in
a design, and not online, or something), could the "ae" in "praefixo"
be an "ae" ligature?  Is it more appropriate to keep them separate?
Just wondering.

"sunly eleSkarez ygralleryf ydZZixelje je ox2mejze."
"No eternal reward will forgive us now for wasting the dawn."

-Jim Morrison