I love that system.
I was debating on the multiple branch drain system but my country doesn’t stock many hydroponic options, the cost of bulkhead fittings is the biggest expense for me so I chosen the domestic plumbing option as I could pick up 40mm (1.5" connectors) easily from the plumbing shop.
I also couldn’t get any square or rectangle containers here, so a standard bucket was my only choice, was impossible to find bigger than 20L without importing it.
If I could get your totes here I’d be upgrading again.
I love seeing a beautiful system though. 
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Long as it doesn’t flood the place and is easy to maintain Im super happy for my first little system.