Build your airplane, not a build log is my advice. Check off each step in the manual with the date, or a quick note on a calendar, take a picture every once in a while (though anyone can pose in front of anyone's project, so I'm not really sure what purpose the pictures really serve), but I wouldn't go to crazy beyond that. Take pictures for your own memories or of things you might not be able to easily see in the future and thus may want for future maintenance. Any DAR worth his or her salt is going to know whether you or someone else built the plane after 5 minutes talking to you.
My DAR didn't even bother with my photo album, but I guess the best advice is to pick your DAR early and ask them what they will want.
Good luck.