Swiss Couple - 2 Weeks Northern Europe

Hi guys, we are a Swiss couple (both 21 year old students) and we are currently planning our first Interrail trip.
We found this forum which helped us gather information and tips and after reading a few posts for journey reviews from fellow travelers, we decided to do the same!

So here is our draft journey:

• Day 1: Lausanne -> Bruxelles (7h23 - 14h27)

• Day 2: Bruxelles

• Day 3: Bruxelles -> Rotterdam (7h49 - 9h49) / Rotterdam / Rotterdam -> Amsterdam (19h24 - 20:05)

• Day 4, Day 5: Amsterdam

• Day 6: Amsterdam -> Hamburg (5h59 - 11h01)

• Day 7: Hambourg -> Stockholm (8h50 - 19h37)

• Day 8, Day 9: Stockholm

• Day 10: Stockholm -> Oslo (6h02 - 11:10)

• Day 11: Oslo

• Day 12: Oslo -> Copenhagen (7h27 - 18:29)

• Day 13: Copenhagen

• Day 14: Copenhagen -> Kiel (13h26 - 17h57)

• Day 15: Kiel -> Lausanne (9h02 - 20h16)

We would be very happy to have some feedback from more experienced travelers :)

We also have the following questions:

1. What do you think of our journey as it is ?

2. What is the pass that we need to fulfill this journey ? Would the 10 days pass work ? Should we adapt our journey to make it work with the 7 days pass ?

3. What would be the approximate total budget per person for this trip ? We calculated about 2000 EUR per person but as we have no real experience for this kind of trip we would greatly appreciate some kind of help for budgeting the total expenses even though we realize that it greatly depends on the lifestyle we will be adopting (consider the average traveler).

Thank you so much for your help, truly an amazing community!