Like your husband, my precision machinist man would be highly focussed (missing breakfast, lunch and dinner most likely) on installing diverters, catchers, overflow pipes and concreteslab with great precision, and get straight onto it if he reads your inspiring post!
The amount of rain in our current place goes horribly to waste down the sewage system in the street. (We have a tiny barrel at the minute for watering a few plants in a square metre of vegetable patch.) Eventhough we could only place it under a shed roof, we'd need the largest barrel with the amount of rain we are having this year, only sadly, it would fill half my garden and leave little room for sunflowers, our favorites this year. But the idea of using this water instead of the mains for our houshold, sure does appeal to my purse and eco-friendly mind.
(b.t.w. Kersies over koek always for the ageing: to celebrate their loving wisdom that may shine upon us to brighten our days, I say!)