In your particular case you need a total of 250 hours PIC, including PICUS time, so about 150 PICUS, plus your 100 PIC.
It depends on the national legislation, but in order to reach that requirement some states allow you to log the legs as PF as PICUS, provided that the "real" PIC did not manipulate the controls, and that he signs your logbook.
You also need to have the 14 theoretical exams done.
After you have all the requirements, during a normal OPC/LPC you can do at the same time the Skill Test for the ATPL, by flying in addition to the "basic" program a single engine ILS raw data.
Make sure your authority accepts the Skill Test sone by a foreign examiner: every state has a different procedure in place in order to allow foreign TRE to test you.
Last edited by dirk85; 25th December 2014 at 11:49.