Doesn't look like it is actually open source, given:
> Or you could do what Norm Sohl did and build a highly configurable machine out of open source hardware plans and the thermal guts of an Espresso Gaggia.
(My emphasis)
> Or you could do what Norm Sohl did and build a highly configurable machine out of open source hardware plans and the thermal guts of an Espresso Gaggia.
(My emphasis)
You can buy almost all parts for the small Gaggia machines online. A complete group costs around 50 Euro, I think, and you can do with that whatever you want.
Would you prefer CNC milling it by yourself, based on some plans?
Difference is really that the open design could be repeated way before design based on existing part would go out of produciton.