Here's what I came up with courtesy of Progressive RC, they've got ALL sorts of parts/pieces to do your own or they'll do it for you but it isn't cheap.....

I think the case is a Pelican, the power supply is a voltage spike tolerant 24 volt 40 amp Meanwell and two CellPro 10XP chargers but no room for storing batteries, that would have just made it too big and I, like you, wanted one compact package for my charging stuff.

Oh, AC power is usually provided by my Honda generator at the field....