My understanding for the BBVA / OAA loan (which is probably similar with the other FTO's) is that:
Any existing mortgage + any training loan (+ fees etc) cannot add up to anything more than 60% of the current market value of the property.
This kind of implies someone with loads of money already or who has been paying their mortgage off for years (i.e. parents).
All the usual risks apply - so if you fail to secure a job and need to keep current while waiting for an eventual upturn then you need to keep up with those payments otherwise somebody loses their house ...