You could very easily make a slide-out bottom at this point. Imagine the floor with 1/2" on each side UNDER the wall framing and the back end. My coop is made just over 4 feet wide x 7 feet long so I can slide in a replacement 4 x 8 MDF for about $6 when the present one wears out. It makes it VERY easy to clean. I just sweep out some poo and shavings, slide the bottom out (There's a wire bottom underneath) and rinse it off. Take a look at:
https://www.backyardchickens.com/web/viewblog.php?id=17397
Or see my personal web page at the link below.
https://www.backyardchickens.com/web/viewblog.php?id=17397
Or see my personal web page at the link below.