Top level stuff here, right from the official source -
Must be registered first -
https://www.faa.gov/licenses_certifi...uilt_aircraft/
Details for airworthiness are here -
http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/4db2c5cd655cb3cc86257647004af4ee/$FILE/AC%2020-27G.pdf
Page 39 has the application form in sample format even filled out for a RV-4
Page 58 has a nice sample program letter to give to the FAA/DAR
I just copied it and gave details to all of it's questions.
I guess this is the "checklist" for your final inspection after talking to your FAA/DAR person who will say what they want, with such things as which inspection plates should be on or off. Ask for an expanded area, I got a 100 mile radius, excluding Mexico.
Simple rule -
do what the inspector wants.
I had the FAA do the inspection and it's easier to interface with them using their forms. I didn't find the need for any other "packages", and a few of the ones I have seen had outdated forms.