That does look like a very nice burner!
I have a few water tube boilers that im probably going to just buy burners for when i get round to sorting them out. Unfortunately they are mostly odd flue sizes. I was going to get them made by maccsteam, as he does custom sizes and very reasonably priced.
I have a K N Harris style scotch return boiler that is nothing short of amazing, but i have no idea what to fire it with. I have a suspicion it might have been built for coal! The flue is very large, and rivetted around the inside lip, so a push on gas burner wont fit.
That and the fact that it holds several litres and was designed with a 120 psi working pressure means its going to be a pain to fire, never mind get tested and certified, i can tell... Its all flanged connectors, very attractive, but a pain to dismantle and blank off for hydrostatic testing.
My attentions have now turned to flash boilers, with a totally different layout to standard boilers, so a standard boiler burner isnt going to work as well. Hence my excitement about russ's experiments- gotta love the interwebz. Allowing geographically distant strangers to geek out about obscure technical details since 1993. Hooray! :)
Cheers!
All the best
Rich