I have a slightly different situation, but I made my false bottom from tubing by drilling holes in it and coiling it on the bottom of my mash tun like an eye on an electric stove. Make sure the tubing is made to handle hot or cold water, some is for cold only. I made the mash ton by putting a drain on the bottom of a plastic 50 gal drum and piping the false bottom into it. It works great for batches from 10gal to 40gal. I insulated it by wrapping it with moving blankets and string. These drums can usually be found for 15-30 dollars. (Make sure you find out what the drum was used for, you do not want one that held anything toxic) I found some that were used to transport solid plastic pellets used in injection molding.
I have picks at.
Friend if you can not see them.