Cat window shelf support

I recently got a 5 month kitten. I remember my cat from years back loved a window shelf that I bought for him... but that's like 30+ bucks.

Why not print and use old hardware around my house?

What you'll need:
Print 2 supports (I used 80% infill and supports). Sorry, the supports will be a process to get out but they are all easily accessable.

Some wooden plank that's 12-16 inches across (the length will depend how long your window is).

1/4-20 threaded inserts and 1/4-20 machine screws (I used .75 inches long, but it will depend how thick your wood is)

And some wood plank that is used to support the part of the shelf that's inside the window.

Optional is some comfy fabric. You'll want to staple this fabric first (stable on the underside so the staples aren't exposed to kitty)