Cupboard heads - automated watering solutions?

[Slippy One]

Hi, any cupboard growers using/built any bespoke watering solutions? 

 

My box is pretty stealth so don't want any blatant reservoir/hoses combo. I was thinking of a dual chilly bin reservoir inside the cupboard or on a shelf with hidden hoses. (actually, this might impede air circulation so probably best outside the cupboard).

 

What do you do? I'm currently wracking my limited knowledge of solenoid valves, gravity feeds to find something to enable me to stop hand watering. 

 

Cheers