Just heard back from Christian who has the bananaswap website and he says he has had good luck with constant 15-18C for 2-3 weeks, then a jump up to 25-30C. He also said he would post a pic on his site of his one with 5 mature leaves that is growing in a room at 25C.
Supposedy the plant has been tried in the tropical lowlands of PNG, and it declines slowly. I heard that there are Glaciers on top of PNG(at least snow), and the temps are really cool. M.ingens may only work in highelevations in the tropics, or in cool summer climates like San Francisco.
Even if it won't work every where there's always M.saba-
http://hortiplex.gardenweb.com/plant...989689563.jpeg