Do I have to travel at the same accommodation type for my whole experience?

No, of course not. The idea of 'Build your Adventure' is for the choice to be all yours! So if you want to keep the costs down and stay in a dorm for a few nights and other nights treat yourself to more luxurious accommodation, you can do this. (Note: this only applies to Build Your Adventure. If you are booking a package, you must travel in the same room type - dorm or bure, you first choose).