Alrighty, folks, with your helping hands, I have ordered a Mega Machine Shop lower through Warren at Ameetech, and an upper as well. I have ordered a lower parts kit made by CMT and an ARFX stock, tube, buffer, and spring through Del-Ton; all I have left is the barrel, front sight/gas block choice, handguards/rail, and rear-sight (upper's a flatty).
I figure on getting a shooting gun before I stick a high-dollar trigger in there; the lower parts ordered individually without trigger/disconn and pins were the same price as a complete lower kit.
I may do handguards and stick a picatinny rail on the bottom - but what I want is a free-float arrangement, since I have decided to go with the 16" M4 barrel.
You may find me back here if, for some reason, I can't "do the math" on the assembly.