I built the FFR roadster 2 years ago and sold it to get the coupe kit I am currently building. As someone else has posted, the ffcobra forum is a great place for information and lots of help/advice.
My own experience so far, the drivetrain and chassis are almost identical (though the wheelbase is slightly longer), pretty easily accomplished after last years roadster build. The body is much more complicated and slightly (almost 2x) more expensive to have the bodywork and paint done.
You are welcome to e-mail me with more specific questions, as my car is at the paint shop now. I hope to be driving in airconditioned comfort in Phoenix Az. this summer.
e-mail is;
mannyjoe@aol.com
HTH.
mannyjoe