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FSDevConf team
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It will be tricky for SketchUp, because with SketchUp you can't place the type of lights that the tutorial explains the tweaks for. ModelConverterX can add lights to your model, but these are exported as effects, not as BGL_LIGHTS. So I think making a PAPI with SketchUp will be hard, the only way I can think of is to manually add all of the light code to the ASM file.
Thank you for your replies.
I see...

Finally, I got "Airport for Windows" and it is very easy to make lights and PAPIs for FS2004 and they can be seen over the ground polygon.

However, I have another problem. I will open a new thread.