Looks good... Good job.
I wouldn't have picked those tubs myself either, but to each their own...

As for the watering system, don't go cheap, you'll regret it. Think of it this way... You're gonna spend $3-4 a piece of bottles. 9-18 bottle depending on which tubs you use. Do the math, for 18 valves and supply its around $100. If you got a good deal on good bottles at $3.50 each, your already at $60+