gaps are not that big a deal,if the hinge line is sealed it helps flight,do a search in this section as MinnFlyer has drawings,the buzz is normal,the wheel needs to be adjusted to the rudder,if it's out a tad it's no big deal.Sounds like you have done a very good job not to have any help,congrats.Join a club with an instructor ,they will check the plane and give you lessons.Now you need to start the next plane.