Hmm. Great feedback. I didn't realize how confusing my descriptions were.
1. Yeah, I didn't copy over the description of the dish and it's location. My bad. If you're going to beam something into space, you should pretty much have some sort of external gizmo to actually do the beaming. Previously, it was massive guns. Now it's a big parabolic dish. Normally partially recessed into the forward hull, it extends forward/out when in use, so it can beam in pretty much any direction except backward. Not sure what you mean by streamlined.
2. I used "as you know" to provide information to the reader that St. James would know. If scientists discovered/proved that we are 4 dimensional beings, I would expect an admiral to know that. I'll see if I can write it without the as you know.
3. Not a portal. If I said you were a four dimensional being (but the 4th dimension is not visible to you), I would think you'd have to imagine something rather weird since humans don't think in 4D (eg look up tesseract for an example of such weirdness).
4. Ok
5. The blast doesn't appear inside the ship, nor does it skip the shields. Perhaps this is clearer: imagine (in 3D) that the back of your ship is unshielded and the enemy could hit you from behind. The back of your ship is simply one side (the 4th) of your three dimensional ship. By comparison, the ship's 4th dimension is similar to it having a "fifth" side. That fifth side has no shields, and the Imperium has figured out a way to see it and shoot at it. If you breach the ship's fifth side, it's just as deadly as if you had breached one of the other sides of the ship. Since it's the 4th dimension of the ship, it must exist in hyperspace (anything greater than 3 dimensions is hyper, by definition).
Looks like the new approach may be too complicated to explain easily/quickly. Not good.
Thanks, George.