Nope. I went to do a Phase II Bridge variant to see if it was closer, and the B-C deck assembly is completely different. It's definitely a custom build up with an unfinished TMP 'mickey mouse' arrangement. (The translucent dome mount is missing, as it is on the photographed Phase II model, but it reappears in other shots.) The B/C assembly looks like it was thrown in specifically in a way that the Miranda bridge could be retained underneath it.Have a look here, there's some pretty goods shots of the bridge (defiantly Phase II) and various other bits.
The official schematics, of course, retain a Miranda-class bridge and B/C deck. Like I said earlier, I was shooting for happy mediums all around.
True the bridge substructure look a little higher than on the Ent, but it's still the same Bridge.

In fact I would say that it being a clear deck higher than the Miranda is especially something you want of the schematics. If anything it helps strengthen the case that this is an older style ship than the Miranda and further helps to delineate the very similar classes.