Ideas for a travel-sized system anyone?

[organicgrower]

Currently i am converting a van into a camper, with the intent to travel in it for some time. I have a DIY system in my home, but obviously i want to take my hobbies with me, so i intend to build a compact one for the van too. Im downgrading to cherry tomatoes, maybe herbs too. It is also possible that it may need to be decently watertight...hmm.
Does anyone have an idea of what might be the best kind of system to go with?

Cheers