Window catio on clapboard siding
We would like to build a window catio for our cats. The trick is that we have classic wood clapboard siding. The house is over 180 years old and the siding is a pain to source with a large enough reveal to match (6" reveal).
Any thoughts on how to attach the catio box to the house without having to cut slots in the siding? We have 2" wood sheathing underneath, so it will have a solid connection at any point we screw through. The window is too far about ground level for a base. We've come up with notching the brackets to fit the clapboards, which can be tricky.
We'll build the catio box to fit outside the window frame to avoid having to drill holes in the original wood trim. We live in a climate that sees snow, ice and heat.