I completed the furnace mod this morning, it took me a while to disassemble everything and to make sure the hole I cut in the upholstry was aligned with the hole I cut in the furnace cover/cap. I got lucky and hit it right on. There is A LOT more hot air coming into the main area now.
The only thing I did not do was install a larger cold air intake grill in the bed area, with the furnace running, there wasn't enough air going thru there to move a thin piece of paper, I saw no need to increase the size. Like Bruce mentioned, I suspect most of the cold air make up is drawn thru the 1" gap between the seat and supports. Probably designed that way on purpose.
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