You need to have knowledge of programming and electronics, if not absurd attempt to address this type of project for manufacturing a robot arm and put into operation through a computer is very complex. For example, the actuators have their own way of working and need a very specific pulse widths to go to a particular location (click here for more information). More questions to consider is how to PC communication to the servos or micro-controller. If you have no notions of management and communications ports with PICs is impossible to approach the project. It is a major project: integrating knowledge of electronics, programming, mechanics, and if you want to do something serious, also mathematics.
I think to make a servo robot arm is not the best because it lacks real power, though very fast, do not know when they’ve reached the end position, so it is assumed based on a certain time. In addition, the servo-motor type “Futaba” radio control (RC), has very low resolution, up to 180 degrees you will get a resolution of about 100 points and “that way”. These types of servos are only valid if the project has an intention robotic toy. The kit of the question is to know with accuracy and resolution the position of each degree of freedom at all times and for that we use technologies such as encoder or resolver. Use pots with A / D converter is not recommended because they suffer wear.
Below are the manufacturing process of educational robots arms. Buy one of these arms is very expensive (click here to see sample prices), only suitable for companies and educational institutions where they will draw a repayment performance and cost. You see in the video is small but professional company Lab Volt and can lift up to 4.5 kilos. Do not know if many kilos can be a bug in the translation of the documentary, normal for this type of robot arms is to raise as much as 2.5 kilos.