RE: Engineering Concept
That's exactly what I was expecting to see in the movie - an updated TMP Engineering set-up but with bigger engineering components. Whoever designed that concept art deserves a bonus.
Maybe though, the concept art depicts what the ejected dilithium chamber sections actually do look like in their on-board set-up, we never actually got to see that part of engineering did we ?
All we got was the fuel pods and some deuterium feed pipes.
Hopefully, we will see something like that concept art in the next film.