Step 2Sizing up the cat
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First thing was to see if the cat would fit onto a 11.5" width board. To do this, I put the board on the floor and plopped the cat onto the board... to which end she would just walk away. So I took a piece of newspaper (ads) and put it on the board and pretended to read it.... 10 seconds later the cat lays down on the board and is a good fit. I figured 22" length would work out.
I cut 2 boards out, so they are 11.5" X 22". Since my cat is old and fat, I figured I should make the perch with a lower level to help make it easier to get to the upper level that is at the window.