I had a Hot Wheels refit Enterprise and ended up returning it. It looked nice in the box, but when I took it out the nacelles were severely warped. When looking at the ship head on, one of the nacelles drooped severely while the other one was warped slightly and curved.
Had the same issue here. Gave it to my fiver-year old and he's had a ton of fun with it. I was far more impressed with their 1701-D and was never able to find the original 1701.