Sorry, another new guy question. I recently purchased a Kreg pocket hole joiner system. Wow, it's fun. Even a no talent like me can now make joints!! The guy at Home Depot says the best is 3/4" plywood. These are just going to be for my garage and painted. I was playing around with this new joiner and the screws seem to strip very easily in plywood vs solid pine, etc. Should I try particle board or MDF? MDF seems to be very heavy. I was hoping for 15" deep cabinets. Should I scale back to 12" and just use solid pine? Thanks for all the help. You guys are GREAT.