I was looking at your model and found some issues. Some dimensions seem strange and some parts aren’t correctly located which I expect has to do with having Length Snapping enabled and rather coarse Display Precision set. Here’s a cutlist of the parts in your model after increasing Display Precision. There’s also at least one excess part. Either Floor or Floor#1
I reworked your model to deal with those dimensions. I also to the liberty of simplifying the build by making the end panels and interior dividers the same size.
Here’s a quickie PDF from LayOut which ought to be enough to take to the shop. I am curious about the opening in the top panel. Seems odd that it crosses the rear interior divider.
CathousePlan.pdf (28.1 KB)