If its your first build, I would highly suggest a Nodak. I would recommend a NON blem receiver but its your money.

The Nodaks go together very well.

When you build one off of a flat it is a lot more time, fitting, filing, heat treating, welding, and drilling. If your mechanically inclined and have the $$$ to buy the tools then go for it. To build from a flat , your probably gonna need about $300 worth of tooling MINIMUM not to mention a mapp gas torch for heat treating, drill bits, drill press etc.