There are, of course, the Coventry and Surya classes from
Ships of the Star Fleet. Both are Miranda-like pre-Reliant designs. But totally non-canon.
http://www.inpayne.com/models/coventry.html
http://www.inpayne.com/models/illusive1.html
Looks like there are logical design-lineage elements in both of these designs. Both are interesting, though both seem flawed to me.
So, you say the Illusive is a "Surya" design by Aridas? Interesting. I like the "Cage" / "Where No Man..." elements. Most of all, I like the smoothness of the main hull that gives the best TOS feel to it. I have to agree that the "elbowed" nacelle wings seem a bit odd, though. Some people like to trash the dish-on-a-stick concept, too. I could live with it, but your Coventry offers another possibility...
Where the nacelle wingy thingies seem to come up through the Coventry's upper hull, why not continue with short, finlike winglets with small, smooth egglike pods on the upper tips of each one? The front of each pod could serve as a platform for mounting a small deflector dish. Each of these stereo pods could also house an aft torpedo bank. This would fit in with the Mirnada design lineage well and still keep the simpler, smoother TOS look.