I just opened the air vents on my mate's DB01R Baldre shell to keep the motor running a bit cooler. I scored round the cut lines with a fresh scalpel blade, used a reamer to make a couple holes in the middle then used some curved scissors to make cuts at right angles right just up to the score line. The pieces snapped off quite easily and I finished it with 800 grit paper.
OK for a first attempt so I thought I'd share. If there are any other threads on this topic please feel free to link.
(paint by Jon at RCS)
