Hi jeffro and welcome to the forum.
Not sure where you can get plans to build but there have been quite a few cheap second hand gyros on the market lately. I guess it depends on whether you want to build or fly - but some one is sure to be able to help you. I'd say a Rosco copy or something similar is what your chasing. Anyway, have a browse through the "Classifieds", might just have what you want.
Have you done any flying - FW or rotary ??
rotor