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The calipers will not take bigger discs then 330 to go bigger you will have to use bigger calipers like the evo standard ones. The k sport kit is a fantastic and you can sell your old brakes which would make it cheaper then buying just bigger discs.In the kit you get calipers / discs / pads / and all the brackets they also supply braided lines.
 
Shame as i think 345mm was a common size so was aiming for around there
Probably remain with 330s then as i dont need a new kit when i have everything for this setup
 
This is something i plan to do when my rotors wear out, i will speak to Bill and maybe pop down and trial some
Looking at the room in between caliper and wheel i think it could go upto 350mm

AFAIK with the OEM caliper 330mm is the max. I.wouldn't push the calipers out with a bigger spacer.
Also the max disc thickness of these is 28mm.where there 345mm discs for the MK2 Leon are 30mm and the big reds are 362mm.x 32mm