Not to pile on here, but building a custom rod is a lot more then saying "I want a King Rod". A good custom builder will take into account your preferred blank action, your physical capabilities, the reel you are planning to use, bait, style of fishing etc. In another words, the total fishing system for what you plan to achieve. The custom rod builder will then build the rod to meet those objectives.
So select a builder that will work with you on exactly what it is you intend to accomplish, then you will get your monies worth out of you custom rod.