During my 2019 xmas holiday I took the occasion to launch again in Italy. Unfortunately I made the mistake of loading too much gas and, as a result, one of the two lift balloons popped shortly after take off.
The silver lining of this short-lived launch is that I think I found my definitive construction style.
The think food foam sheet I used is useful to provide some mechanical resistance to the solar cells and also to keep the transmitting electronics a bit warmer.
I have a feeling that next launch is going to be much, much longer!