Redesign the ship.
I love the NX-01 interior aesthetics*, I love the concept of a
TOS prequel and the idea of the
Enterprise being Earth's first explorer ship, I love the idea of it being a bridge between present-day humanity and the aspirational perfection we often see in other
Star Trek series. But I still just can't accept the exterior design of the
Enterprise.
Beyond the age-old "it looks too much like an Akira class, it's too advanced" arguments my issues are:
• The NX-01 is simply too big. One of the things they were going for with the interior design was the cramped "submarine" feel the
Defiant had – yet the NX-01 is surprisingly large, about three-and-a-half times the size of the
Defiant. The overall volume is slightly smaller than the TOS
Constitution-class – 199,500m³ vs 211,200m³ – but because the
Constitution-class's nacelles are proportionally much larger, the habitable volume of the NX-01 is actually bigger – 166,000m³ vs 156,000m³!
• The NX-01 sets the template for all future Starfleet ship designs for about a thousand years, which seems odd when you consider that at the time it's built it's more primitive than the ships of certainly the Vulcans and the Andorians, and also probably the Klingons. It would have been nice to see elements for future starship designs spread across the other founding Federation members. Hell, it would have been nice to see the NX-01 having a completely different design altogether – something more like the XCV-330, for example – or something that didn't already have all the major features of future ships out of the box, like the
SS Emmette from Enterprise's title sequence.
• No transporters. They should have been entirely reliant on shuttles only.
*The one thing I'd change is the warp core.