isthmus
Warlord
IIRC, you still need to tech to Alchemy or something for Refineries, which is on the magic line.
And yes, even if the Ordo is removed, I was basing it off of the current version. Because of the breadth of changes for the next version, it's going to require an entire new set of tips because the strategies will be so different.
Alchemy boosts the yields of the refinery, but the refineries themselves can be constructed at steam power by an adeptus. Alchemy only requires engineering I think so it's actually on the construction line, but a link to the magic tech tree may not be such a bad idea. It seems that the mechanos can kill a lot of birds with one stone (or tech tree, since most of their UU and UBs are on the conscruction line) so linking alchemy to the magic tree sounds pretty good, I think.
Edit: Oops, valk beat me to it on this one
And sorry, I wasn't dismissing any of the strategies relating to the ordo that you posted for this version by stating that it was due for removal, I was sort of trying to say that many things will need re-evaluating when the new RiFE comes along.