Very handy, i have to say. Much nicer than drawing in Photoshop, I find.
'draw vague outline shapes/get main forms done/fill in the details...'
(not that helps as much as seeing it'd be but . . . )
It was a while ago, but...
The detailing takes some influence from Warhammer 40K, but mostly I think my mech style evolved from the E.V.E. Protomecha series...
Plus making things more organic like that makes it easier to get away with some asymmetry in my drawing...
"sketchbook" as in real-world sketchbook, or is it a program you have used called "sketchbook"?
Again, very nice design. You going to color it?
Don't think I'll get around to colouring it, but it might be fun.