Attached Shed w/Slab Concrete Foundation

I enlisted the help of my dad to build a shed and we were able to build this addition in about two weekends. This shed will provide a hidden area to house my large dust collector and 60 gal air compressor. This won't just free up space, but will keep the noise in my shop down dramatically. I've included a link to everything I used below, let me know if I missed anything! And if you're interested I would say the whole project cost around $1200.