Kumiko, Shokko panel generator

Inspired by the Japanese carpentry using Kumiko patterns I put together some code to generate the Shokko style. 

The generator will generate a panel of any size specified in the x/y dimension with a specified number of patterns. The thickness of panel can be set. A boarder can be generated, there is an option to turn this on/off as desired.

My though is to use this to generate panels which can be added to other designs. 

I've included a printed example which is a small panel 30mm x 120mm, which is makes for a great book mark.

If you like this I also have a Shippo and Asanoha panel generator, but Shokko is my favorite.

Finally, the code has been tested and I think it's fairly robust but it could break if you push it. Let me know if you have any problems and I might be able to help.