Great job. Nice setup on your patio. Perfect for your collection. How did you flare the legs ? I have a couple kettles with loose legs.
I flared the leg sockets using a flaring tool out of a set I bought quite few years ago. It has a lot of different sizes for different pipe. They are just pieces of round stock that gradually get bigger and you hold the pipe steady and hammer the tool into the end of it. I have also used an extension from my gear wrench brand pass through ratchet and socket kit I have at home for a quick flaring it fits into the legs just right.
I would imagine a small tubing expander would work for this also and I believe they sell them at harbor freight. Just remember slow and steady is the key to success here slowly work it to the size you need, testing the fit multiple times along the way.