You are on the right track. The jgro build is the simplest and most accurate for the money and time spent to build. You should read the following thread by joe2000chevy. He has great ideas on building this style of machine and you can get a good education from the thread. The thread is found at:
Joes 2nd Machine
Additionally is his latest build at:
Joe's CNC Model 2006
Really, the guy is a genius and you can learn a lot from his build journals.
Good luck and post your progress with pictures.