My chassis is 1.9mm Ti, grade 4. Weighs around 250g I don't think I could do that any lighter given the shape and size.

The motors are 80g each which doesn't sound like much, but could do with being more powerful.

@Matt the Brushless I'm using has an impressive RPM but not much Torque so I don't think it would fair well for drive, plus bi-directional brushless ESC's are expensive.