Aug 18th 2011, 5:18:40
At 23k acres it will cost just barely under $2 billion to switch to TMBR. It will also take about 110 turns. During those 110 turns, you'll get some production while switching buildings, so you'll probably lose out on about $1b worth of production for those 110 turns (as a rough estimate).
In all, the switch to TMBR will cost about $3b in terms of lost production and cost of buildings.
If you ended up with 8b stockpile, you'd lose $3b to the switch, and get 6m networth per billion on the other 5b, for a 30m networth jump. After completing the switch (which would take about 1.5 days), it would take about 1.5 days to jump.
If you didn't switch to MBR, you'd end up with 8b stockpile, and you'd get 4.5m networth per billion on all of it, for a 36m networth jump. It would take about 2 days to jump. Because it would take slightly longer to jump as a non-MBR, you'd get about half a day more of stockpiling in if you jumped as a MBR, or about another $400m worth of stockpile, but still not enough to make it better than not switching to MBR.