I just stuck some lights on in places where I planned on putting decals, but that will no doubt change as the build progresses. The changes were in the proportions and the removal of grilles, you'd need side by side comparisons to see they're thinner and flatter than before.
, the rollbar is pretty integral to the design and adds a bit of balance, particularly in the side view. Without it the ship looks a little odd and unbalanced. Didn't they hack the rollbar off and use it in TNG as a ship of the week? It looked pretty awful, called it something beginning with 'L' I think; Lancaster or something?