The TOS era Charlemagne looks more like a predecessor to the Centaur from DS9 than the refit Charlemagne. Which is to say, really cool and clean looking.
Just a bit of a neck on the refit Charlemagne--like on Orne's -R concept would help round it out. Have the nacelles a bit higher...
I think the Charlemagne's main deflector is too obstructed by the bottom of the saucer. Really, the same thing goes for your 2268 Voyager.
Minor nitpick - I realize you're still learning how to use PdN so take this as a suggestion: Make alignment lines to keep everything "in sync". At a glance, the three views look fine but when you orient them drafting style, the parts are off center and off alignment from one view to the next. Create two layers in PdN - one for the red lines, one for the blue. Move them up to act as your two top-most layers. Draw center lines starting at the bridge dome in the top view (use the hull grid lines for reference) and align your other primary hull views with each other, then work outwards from that point.
It kind'a does, doesn't it? Did you note the scale change I did with the simple expedient of re-scaling the airlocks and bridge?
Felt like doing a little "detailing" so I did some cleanup and finishing work on the Christopher and then did some new stuff refit Resolute class and the Yeoman-class cutter
This is something closer to what I had in mind when I started what turned into the Gopher: Puddlejumper-class runabout
something quick and dirty I threw together in about 20 minutes. 174-class warp fighter and, thanks to a helpful associate, I got hold of a sheet of Klingon parts. True to TOS, the first appearance of those parts from me is a version of the popular "twin hulled" Romulan battlecruiser based of the D-7/K'tinga hull, which I have dubbed the Bloodwing class:
I really like the Puddle Jumper and Warp Fighter. I was tempted to call them 'cute' but that did not seem dignified. I'm less enamored with the double-hulled Klingon ship. It just seems awkward to me. The Grishna D-8 is very cool - a big intimidating design that still manages to look graceful.
^ That double hulled Romulan ship is just an attempt at a predecessor to the D'deridax class. Only it's not quite as organic looking. Still a neat idea.