Hello dear Nodebox Forum

I just stumbled upon Nodebox 3 yesterday and have to say that I'm kind of amazed by it. I was playing around with some simple data visualisation and came across my first problem. I took the dataset from the data vis tutorial. Wanted to make blocks and then distribute them on top of each other. The spacing between the blocks should always stay the same. Respectively the height of a row should be the same as the block.

Here is what I tried. The row height is allways the same for all data entries.