Don’t see any steam in the punk here.
That’s why you have to follow the link, wherein the very first picture points out the steam engine with turbine. Probably a Stirling.
Oh, and very little of the Steampunk School actually involves actual steam. Most of it involves hot chicks wearing smoked glass and leather goggles, with interesting brass ray guns, and complex corsets. And hats. However, the entire design school encompasses ultra-modern design built with polished wood and brass, to create that “H.G. Wells looks deep into the future from 1855” look, regardless of when H.G. Wells actually lived.
One of my favorite readers, ooGcM knupmaetS, is a Master Ninja of both cosplay and steampunk, two design philosophies that intersect only in greater Tokyo and the more salubrious suburbs of Edinburgh. He can answer all your questions on the subject, although “boobs, leather, electricity” might not be the answer you’re always looking for.
Boobs are always the answer. Just have to ask the right questions!