benish - I know I'm going to get bitten for saying this - but if you have to ask ask what ratings/qualifications you can do as part of your PPL then you really are not in a position to start calculating the budget for an ATPL.
If anybody wants to bite, go ahead, I don't care any more - just trying to help.
As has been said, there's no such thing anymore as a night rating nor is there any such thing as a "frozen ATPL".
The night *CAN* be flown as part of your PPL despite what you've been told here - but then so can your (so called) "hour building".
Why not take your PPL skill test (required for ATPL groundschool) at 100 hours total time with some 65 command? The PPL is *NOT* a 45 hour course.