Cut 2 x 4 to length.

Use drill and screws to connect to make a frame

Once top and bottom done, connect all to see how it looks as a frame.

Put dog inside if u like before putting the plywood. And measure the length of the plywood to size of your frame and screw in to frame.

After plywood has been put on, u can add the door, a window and if u like moulding to make the front look nice.

On the first night, my bullies are loving it. This is me checking on them at 2 AM. Didn't even here me coming.