Quick note for those that are making irregular shaped tanks. The simple method for measuring the volume of plugs is to find a bucket or bowl that can hold the plug plus enough water to cover the plug with water when submerged in the bucket or bowl. It helps to have two people for this...First, fill the bucket with enough water that when you push the tank plug into the water, in can be completely covered with water. second, after the plug is completely submerged in the bucket, make a mark on the inside of the bucket where the water stops rising after submerging the plug. Remove the plug, get an accurate measuring cup, at least 32oz. Fill the measuring cup with water to an amount less than the projected volume of the plug, write the number from the cup down and pour the water into the bucket. Repeat the process until the water reaches the line on the side. The result will be close to the exact volume of the plug. The works for male tank molds only, and is only approximate to an ounce or so. It's a good idea to do this twice to confirm the volume.[8D]

Dan Gill,
Details 4 Scale