If that was someone’s DIY setup, I would be in awe.
I’d never buy it - but it’s still overkill goodness. 
i played on something very close to that at SEMA, it was sick
Were I to do it all over again, this is the stuff I would use:
http://www.alufab.cc/aluminum_extrusion_things.htm
It isn’t horribly expensive ($60 per 8 foot section is what I’ve seen at MSC) but the results will look much more professional than a wood frame, and it will be lighter and more portable.
They like to refer to this stuff as the “industial erector set”. All you need to build with it is a chop saw to cut your sections to the right length. Pretty much all of our production equipment at work is put together with this stuff. I wish I knew about it sooner.