Hydroponics system planning

Have grown up in a rural area, so growing food has been a hobby for a long time. Have been mostly travelling recently, so projects have been on hold.

Now hanging in the middle of a big Spanish town, trying to make some DIY growing platform, from recycled materials found inside the house.

So far only needed two tools, a pair of scissors and a tin smelter for the holes. The most effective thing still might be using an air pump, 3W if I recall it right.

Could not find a shop selling seeds or earth, so need to wait until the Martial Law ends. Well planned is half done, like the old folks say.