This took me quite a long time but I managed to create a functional but a rather expensive cargo ship. It costs me 99% of my budget and I only get a razor thin profite.
There isn't much to say about this ship as the high fuel, air and water requirement was my biggest concern and there wasn't much space for improvisation.
It has enough energy to power all systems and even though I just noticed that I forgot to connect the outer hatches at the cargo bay (:D).
The ship has enough EEV as I think that safety is an important matter in a civil ship and I hope this can replace the missing galley I couldn't fit in.