The 350 scales are pretty thin (I'm basing this off of the Tyrade). You could add a bit of sculpting, though. Just remember not to cut into the torsion bar pocket.
G10 is difficult to work with, and it is incredibly bad for your lungs. Wear an approved respirator and/or work under a flood of water to keep the dust down. I would do all of the work by hand, rather than use a dremel (it won't take long). Wrap different-sized cylinders in sandpaper to make things like the finger-choil radius. Then smooth it all out on a flexible backing (I just use some camp-foam).
On the plus side, polished G10 looks really cool.