Hey Kas. I'm trying to build a similar robot. The only problem i have now is that my servo's do not turn exactly a 90°. They turn like 90° in one direction and 75-80° in another. I'm using a digital Tower Pro MG995. I've seen that you are using Hitec HS-422 which are analog and should be more precise (from their description). Is there any difference between analog and digital. Are HS-422 precise enough? Will they give me a complete 90° turn?