Looks like you're well on your way to a solid little rifle.
YouTube will be an asset when you go about building the lower. It can be done in 20mins, but I've never done it that fast. Set aside an hour or two, check and double check, and take time to tackle each step properly the first time.
Also- If you want any special options (ie- end plate sling mount), it's always best to sort that out before anything wears Locktite.
"The Future is Unwritten"