honesty is the best policy and few alterations are required for this.
resale won't hurt much unless the parts are repainted then maybe the buyer will make a fuss,
so keep the original parts which you have just incase.
and most likely if parts are brand new and genuine and not repainted the next owner will be glad that the car is having the face-lifted look
i say go for it. cat eye is a pretty dull compared to eagle eyes which is my favorite civic to date.