Would it be something like this?
Helsinki – Tallinn by boat, then ride to Sigulda Latvia. Then Lithuania, Poland, Slovakia, Hungary, Romania, maybe Bulgaria, Serbia and Bosnia. Then by Adrian Sea to Croatia, Slovenia and finally to Italia and Milan. From there the bikes would go by truck back to Finland and the riders takes the flight back to Helsinki.
This is the plan now, lets see how much it changes until the summer 2015 is here.