Thanks. At first all I was bringing up in my search was stuff from UK.I will state the obvious. Google "steam boiler kit". Lots of sites sell them. They also have other things like pressure gauges.
Have not watch her series on that yet.The YouTube channel "Blondiehacks" has a female machinist who does a series on making a steam engine AND fabricating a boiler.
I have watched it, and her techniques are sound.
She uses raw materials, to construct the boiler. She did not use a kit.
She does it as a 9 part series on her channel. It is a really nice vertical boiler design, with no corners cut.
Thanks for the link.Plan B would be to buy an old Mamod steam engine, and recycle the boiler. They can be found fairly cheap. I had one as a kid.
The link below is one which is for sell in the USA for 99 bucks buy it now price.
The Brass and the various goodies would likely cost you as much to build.
ebay mamod steam engine
Thankshttps://www.pmmodelengines.com/ a US supplier,, I've used Reeves model engineeringhttps://www.ajreeves.com/ and Stuart Turner,, shipping on a small packet from the UK is not that bad actually.. you can do an online order to check shipping cost.. ebay seller dtjsteam is a good supplier..