Looks pretty cool. Nice work on the base - looks 'manufactured'. The IR thing will do what - scan around? Detect motion?
I'm very interested in your driver strategy. I've found that the 1-degree steps are pretty coarse. So I'm trying microseconds from about 650 to 2400 (seems to concur with Federico - but I'm not sure I understand it yet).
This is a couple bits from my code: 1st is servo 1, second is servo 2, third is time interval in ms:
{650, 1000, 2000}, //650 is about the limit for ccw rotation
{2600, 1290, 1000}, //2600 is around the limit for cw rotation