The upside down original Reliant design always bothered me.
It's a hell of a thing...
With the nacelles "up" and the photorps "below", I suppose it's a more proper Star Fleet design, more in keeping with the Enterprise style.
And really, there's nothing wrong with the Reliant design having the nacelles overhead rather than underslung. It's seemingly a perfectly valid starship design.
But damn if I can't get my head around it.
After decades of having the Reliant ingrained into my brains, a design I really love, I can't see the up-nacelle version without thinking it's just wrong. And there's no reason to!
Hell, I can even accept all the other kitbash variations of different ships, usually no problem.
But the Reliant? Nope. I don't know why.