you could try to contact the P-Cola Museum, ask them who builds the carriers on display there www.navalaviationmuseum.org , they might put you in touch with some of their builders
at least 4 of them are 1/144 scale
plans could come from someplace like floating drydock at www.floatingdrydock.com
and the folks that model ships at members.boardhost.com/Warship could help with advice, Steel Navy also has an older Carrier page at http://www.steelnavy.com/
a 1/144 Nimitz is only 8 feet long, any other carrier except the Enterprise would be shorter