This is a build I've been tweaking for just on ten months now. Took a while to work out its most efficient grain bill water ratio but now efficiencies are all in the 90's with 12kg grain bill to 106 litre mash.
with the malt pipe suspended I increase the capacity of my mash tun to reflect the grain weight and absorption as long as I keep the recirculation at the right rate. This is my grain bill after crushing primary and secondary