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I did post pictures of the furnace itself, on the first page of the thread:

http://hvac-talk.com/vbb/showthread.php?threadid=49189

While people did spot other issues (copper condensate piping...

No grain, just a light texture to the surface from the ground up wood and plastic mix. It will be completely weathered withing 6 weeks of exposure, and then never change any further. Any lumber...

http://www.trex.com/

No staining (unless you want to for color), no splits, splinters or rotting, weathers to a nice light grey. Completely impervious to water, it's made from recycled plastics...

http://ww2.imagewiz.net/images/hvac/50300_vent2.jpg

Note the downslope on the exhaust and how the combustion air intake is only 2 feet away from the water heater power vent. Also, directly above...