Gun Surfer,
Yep, I have used a number of the TM's to build guns that were reliable and cost effective. If you go with the 80% as you have shown, all you need is a drill press (but I did use a mini mill). The hard work of the stock thread and magwell have been done.
TM does provide jigs, and blueprints are online to find the FCG pin locations. I estimate that you should be able to finish a TM 80% in under 45 minutes....

I have bought several "raw castings" and I am still working on them 10+ years later! LOL!!! The magwell has been a BIG problem. I did buy the threading tools for the buttstock threads.

And yes, the price of finished "no name" receivers is rock bottom right now. I have seen them around $60.00 on some group buys. It all comes down to your technical level, and your interest in "rolling your own". I would suggest that if you are hesitant on getting your hands dirty, stick with a good lower manufacturer...

BTW, most of the AR's I have posted on this site have been made from TM, 80%'s unless noted otherwise...