You can see the brown beam going around the building..
thats at 7'.. I am putting a 2' wide shelf most of the
way around the place for storage.. I already have storage
above the clean room/office... I didnt put it in front of
the hoist or where I have cabinets.. I bought a bunch of
Air Force steel wall lockers that are 8' tall so the shelf
didnt fit there
EDIT
let me get a smaller pic... looks like I dont have any
small pics... but there is a beam at 7'