Hi bombardier. I'm not sure I can explain it any clearer than in my previous reply. If you follow my instructions for installing the C-5 it should work. The aircraft is configured ready to go. Let's try again. If you double-click on C-5M.zip this is what it looks like.

To install the aircraft to FSX paste the C5M folder I've marked with a red arrow into your FSX\SimObjects\airplanes folder. That's all there is to it.
There's no extra gauges to worry about & no need to create folders or paste files to any other location for it to display on the selection menu. Once you have it working find the file named fx_smoke_f6.fx & move it into your FSX\Effects folder.
I found a Posky 747-400 KLM posted here.
http://www.simviation.com/simviation/?ID=60&page=97&mark=10099Downloading it now to check it out.
PS. The 747 is configured in the same way as the C-5.

To install it paste the folder marked with the red arrow into FSX\SimObjects\airplanes. It doesn't get any easier. Once you get the hang of this you'll be kicking yourself.