My mat is big, don't fit in the space under the keyboard
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I use a piece of heavy cardboard as a cut mat.
The building now is going very well. Finaly I understand the instructions.
Tomorrow I put new pictures.
whulsey, the mat close my keyboard is my mousepad. It's the only mousepad type that my optical mouse accept. The surface is good for a cut mat, maybe when it get very old and I need to replace, it will get some great finish.
My mouse pad have ink, glue, cat fur, and other thigs :D