Use this repository instead of the CyanogenMod/android or stock AOSP/android to pull in the needed LG One sources. Then follow the build process as set out in the CM wiki.
Note- this is the BACKside kang of the inferiorhumanorgans kang of CyanogenMod's kang of AOSP's Gingerbread branch. Thanks to Blarf, BobZhome, mrg666, kermikalelite, whyzor, asadullah, bigsupersquid, leslieann, and many others! Special thanks to zefie and koush for the original setup of the thunderc folders, and the original recovery. And thanks to the CM and AOSP teams!