I love this guide, I am about 2 1/2 hours into the process and just starting the 5th chamber of 24 total... turning out great, just lots, lots, lots of sanding. and tons of sanding bits. I am starting with 60 grit 1 inch flap disks, then moving to 80 grit tapered sanding disks for tighter area and to smooth it all up a little bit. If you were brave you could start with a small cutting type bit and just keep it moving fast. Some of the cast imperfections are quite deep.