i have st170 discs and mk3 deo callipers on mine. brakes are now brutal lol
i belive that all mk3 mondeo callipers are the same.
you need to drill the hub hole out to take the larger bolt for the calliper, and shave a bit off the top and bottom edges of the callipers with a grinder, but its nothing to worry about.
awesome setup for the cash.
as for the rears, yes you can use the st170 setup. i done a fitting guide a few years back in ff mag on a mk5 fez, but the puma uses the same beam etc.
need hubs, discs, callipers and handbrake cable iirc