Here is the 20×24 silver tank I had made with a terrible dodgy brace/leg systen. Originally I needed about 14 litres of silver nitrate to fill… way too much.. that’s more than $1200! But I have it chocked out with styrofoam nearly halving the volume to only 7.5 litres to immerse a 12×20 plate. Not bad. Bonus of this tank is it can do 16×20 plates if i ever go that big, although unlikely. 11×14 and 12×20 is good enough for a long time.