@ Praetor That is a great find with the Jenolan. I'll have to work extra hard now to find evidence that reinforces my entirely personnel preference for the movie aesthetic over TNG aesthetics.
Though if I recall, that model was a reuse of some kind of shuttlecraft in TUC. If the scale is meant to be anything close to that shuttle, then extrapolating a "full size" starship's warp core from this vessel is problematic at best.
Even though it was a reuse of the model, many details like a bridge module and windows were added to denote a completely different and much bigger size.