I'm sure this has been brought up a bunch of times already, but I need a bit of advice. I recently had a buddy weld up an adaptor for my brinkmann turkey fryer burner so I can put my keggle on it for a boil pot. It turned out really nice and I was talking to him about brew sculptures. He was getting really excited about the idea if welding something more for me. Another coworker over heard us talking and I said I just need another keg then we can get going on it. He chimed in "I have a keg at my dads house that's about 10 years old" ... I'm getting that keg on Friday. My question is now what... I have a boil keggle already. I'm thinking I might make this one a mash tun. I really don't want to make a direct fire mash tun. How well do these thing hold heat? I'm still doing extract batches and am looking to switch to all grain very soon. Any suggestions?