This might come in helpful for people like myself wanting to start building;
http://www.instructables.com/class/Robots-Class/

Can I ask what type of scribe you use and what other tools are useful?
I imagine a mini vice-grip, a dremel, a circuit board holder, pliers (not sure which type is best?) might be useful. I can't think of what small tools to shape plastics and metals with (into precise shapes).
A sticky for flipper mechanisms and spinning weapons would be very useful (and avoid repeated questions I suppose). As would one on batteries and radio transmitters.