Missing airport buildings - converting bgl files

Hello,

I have some interesting problem here. First of all, I never made sceneries and I am dont know much about it. 

Three months ago I steped up to P3Dv.3 and really want my homebase in P3D. But scenery is only for FSX. LKLN - Line - Czech Republic - Europe. I know, that it could be compatibility problem, but someone told me, that it can be figured out by changing format of bgl files with ModelConverterX.

Scenery is here: http://www.flightsim.cz/fsitem.php?act=exe&id=694&menu= 

But after adding scenery to P3D, airport has missing every building and stuff. So I checked this:

http://www.avsim.com/topic/414443-thai-creations-mumbai-india-is-out/page-10#entry3123675

and this: 

http://www.avsim.com/topic/456188-fsx-scenery-airport-scenery-to-p3d/

and tried to convert bgl files to P3D format with ModelConverterX (last version). 

But nothing helps with that. 

I tried contact autors, but they stopped developing with FSX, they haven´t P3D yet, so they dont know this kind of problems. I trying to figure this out, because theese guys made every bigger airport in our country and if I will succesfull here with LKLN, I can help them with changing rest of airports. 

Could please someone check this for me and help me? 

Thanks a lot

Have a nice weekend

Jiri