great job man, and props for all the thought and skill you put into it aswell.
just wanna point out that even though you used self tappers, you mights wanna end up going with nuts and bolts through the EMT further down the road if you plan on eventually using the rack. i know from experience that self tappers can rip and eventually strip out of EMT... I use to do electrical work in Florida, and thats happened a couple times. but otherwise great job, makes me wanna do something seeing i have a crap load of emt stuff sitting in my storage