So build it. With Vance's toolkit, it's easy enough. Take a scan of the Heavy Cruiser Evolution chart, and resize it so the Ariel's engines are exactly as many pixels long as Vance's LN-64 (~446, IIRC). Then you can paste in the Ariel saucer onto the Belknap, paste in the ACE, and see how much you need to stretch that Belknap secondary hull.I'd love to see those ACE nacelles on stretched Belknap type secondary hull but with an Ariel saucer.
A refit era Galaxy class.
I'll probably do that with paper at some point. I want something a bit more than what the toolkits offer.