I see that you achieved a "zero" for your test score but you don't say if you are male or female and what age-bracket you are in. Are you still "pups"? Curious...
I achieved a "3" for my test score and I am in the 50-59 age bracket (male). My weakest area is right in the middle of the blue-green transition area, which I believe is common for men. My visual acuity isn't what it used to be (need reading glasses) but I'm happy with the results of this test.
@miah, Relax! There is nothing wrong with your Canon EF mount or Canon's QC.
As previously mentioned by Mt Spokane Photography and RLPhoto, that left to right play is designed in tolerance. Imagine if that play wasn't designed in to the EF mount how difficult it would be to mount and un-mount your lenses! Then you would be complaining how difficult it would be to mount and un-mount lenses!!
On the other hand, if there was in and out play (as opposed to left and right) after your lenses are mounted then you should worry, otherwise you are worrying for nothing. Move on and start making pictures!
Get the 5D Mark II while you can as it will soon (2-4 weeks +/-) be gone for good. IMHO, looks like it's already a closeout price to me - I don't expect to see any further major price drops for it.
Consider the 6D (also FF) as it is newer tech at Christmas sale prices. Prepare for the 6D to bounce back to it's regular price after the current Christmas sale is over. Bugs, if any, will be few and far between.
If price is your sensitivity then get the 5D Mark II, if not, then buying the 6D makes sense.
There are a number of free software programs on the net that will do what you ask. Perform an internet search (Google, Bing etc.) for "Free Photo Mosaic Software" and a number of software options will come up. Good luck with the execution of your idea.