The airplane designers will provide you with an estimate that usually is somewhat optimistic.
Find out where the nearest Chapter is and go to their next meeting.
EAA hosts a number of workshops around the country that are designed to introduce people to the skills required to be able to build just about any aircraft.
There are also some annual publications out there that list everything people can build and fly.
There are many good publications that provide comparisons of various custom built airplanes.
One extremely critical issue is the type of materials used in any aircraft construction project.
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Typically, items like upholstery, engine, instruments and paint will come later in the process and may not be included in a kit.
Two of the most serious issues involved in the custom aircraft building decision.
Guinness World Record.