I want to make some old time wooden shotshell case boxes and I don't have the dimensions for the sub-gauges (20 and smaller) I'm talking about the old wooden box that hold a real full case, not these 10 box cardboard things they sell now. I know, I could stack up boxes of shells and get the dimensions but I can get exact measurements including the wood thickness if someone has some actual case boxes in .410-20ga. Thank you to anyone who can help.