Some Articles On Building An AR

My last AR build was a lightweight AR 308 rifle I put together about 4 years ago (see here and here). But I'm starting to look at another build--my wife forced me (I'm not exaggerating, either) to buy a lower receiver to go with an FDE upper I've had sitting around for years--so I thought I would refresh my knowledge of what I need to do. A few articles I located that I thought would be of interest to readers:

• "How to Build an Affordable AR-15 Rifle: DIY Step-By-Step"--Firearms News.  
• "Building Your First AR15--A comprehensive guide to choosing parts and assembling your first AR-15 Rifle"--Aero-Precision.
• "AR-Builders Check List: Parts and Tools Needed"--The Mag Life. 

I think the FDE receivers will match up nicely with green furniture. But I'm not sure of a caliber or use for the rifle to guide the rest of my build. I'm tempted to just put it together as a rifle for one of my sons.