Downgrading OS X Yosemite to Mountain Lion on brand new Macbook Pro Retina

Hi all...
Some background...
I'm awaiting delivery of a new CTO 13" Macbook Pro Retina and have a question or two.
Obviously the new machine will ship with Yosemite, but I intend to downgrade to Mountain Lion. My main use for the new Notebook is audio, and a lot of DAW software and plugins are not stable on Yosemite yet. I have a Mac Pro 6 core 3.33 tower system that I only jumped from Lion to Mountain Lion on a few months back, as I find I get rock solid performance by staying one or two OS X releases behind with all the stuff I need to run. My Mountain Lion upgrade was done through the App Store.
My questions...  on the Macbook Pro (this is my first laptop ever), can I simply log into my Store account and download and run the installer for Mountain Lion from my purchase history? The machine will be brand new.. with no personal info or documents etc, so is there really any point doing a backup beforehand? Will a Yosemite machine let me run an installer for an older OS X?
If someone has experience doing the same, I'd greatly appreciate advice on what the best way to complete the downgrade would be.
Cheers!

Question should be - why can't I purchase a mac direct from Apple with an operating system less than current?
Particularly if a business can afford additional devices but not the updates required to get software in line.
This is also an issue with windows computers - Small company owner needed a few more PC's for his businesses that had just completed an PC based system install that ran on XP -- they came with Vista or windows 7 (don't remember which) his businesses were large enough that he did return them and get XP PC's.     (Software was not compatible with other than XP)      Few years later - went with what used to be called "smart terminal" no PC's on the desktop - all info on a server. 

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