Great job Tomas. My wife and I have been using containers like that for years and sometimes our fridge is like a game of Tetris!
When you're putting it together, make sure you take into consideration space for beverages. You're currently too tight for more then a beer or two and I usually keep a few beer and a few cans of Coke in there at all times.
I use a couple of these containers, but I don't use that many due to the fact that they take up more space than the food they contain. There is always going to be some wasted space.
There are many pros to using these though:
1) ease of access to your items
2) prevents leaks to keep your fridge clean. The lids really lock down tight on all four sides and they have a silicon gasket.
3) containers are quite durable
4) easy to see what's inside
In the end, I've resorted to double or triple bagging everything with freezer zip-lock bags. I can get more food in there using this method.
I have used this for about 3 weeks of travel and it has worked very well. We don't drink sodas and I usually do not bring beer. When I start the trip they are all full. During the trip if any get empty I will them with water to ballast the fridge.