CaptainChar

According to the series "Star Trek: Enterprise", the warp nacelles are enterable and there is a catwalk inside them.

Unfortunately, when the ship is at warp, the temperature inside them rises to inhabitable conditions.

on The Next Generation, there is a small room with a blast shield and then force field, and inside the nacelle is the warp coils which plasma is accelerated through, I may feature a version of these rooms in my enterprise-A