If I understand your question correctly, I think I have an answer. I couldn't find a photo, which would have made the answer very simple, so here it is in words.
I assume you have the body plan and are cutting frames out using the plan as a guide. I also assume you are attaching the frames to a keel cut into the shape of the carriers profile?
Modelers sometimes use the block carving method for the bow and stern so that they don't have to plank the compound curves typically associated with these areas. The normal plank on frame method is to cut the keel to the shape of the profile, including the bow piece.
I know it's crude, but something like this, with the vertical piece the correct shape of the bow up to the deck.(ignore the dots, I had to put something in to space the angles properly)
............... ___
............. /.. /
............/.. /
._______/__/
Body plans don't always give you enough frames for the bow section, so you might have to make a couple more to follow the curve to the end and support your outer skin properly. This can be done using the lines plan, but you probably don't have one, so you will have to guess.
The new Nimitz bow has a bulb on it
But the original is straight down without the bulb. If you want to do the bulb, you will have to shape it out of foam or wood and attach it after.
Once you have the frames on, simply run the planking to the very end of the keel profile and glue it securely all the way up. Putty and sanding will get you to a smooth edge.
The added problem of the carrier is the large flat front, you will have to put a cross piece on the top front edge of the keel profile and a flat triangular piece on the very front for the higher planks to attach to.
I hope that's clear, I wish I had a photo to show it better.
Good luck!
Darren