Hallo Windt H.J.!
I think that my english wont be the best but I'll try it ... ;o)
Your robot looks quite good and it seemed to be hard-worked.
Now my questions:
How large is the angle of rotation of the sensor tower?
How quickly can it turn around?
Do you only use this sensor tower with the SRF08 to look around?
Is it possible to nod the tower for looking around in an other vertical angle?

I hope you all understood me ... ;o)