As far as the plugs for the Frag tank, I would start with them ASAP. It's going to take a month before there tank ready.
Here's a cool way to do them. Take a bucket of fine sand, make sure it's moist. Push a piece of dowel or model of your frag plug into the sand, fill the hole with the plug mixture. The tough part is designing you model to push down into the sand. In the example I saw they were using a piece of small broom handle with a piece of larger dowel nailed on the top, made a nice T impression in the sand. They looked nice when they were done.