To avoid the error "visual model couldn't be displayed" you need to restart FSX. Check carefully how you wrote model.cfg, double check file names inside model folders, etc... Each time you change something related to the MDL files or model.cfg file, you need to restart the sim...
Sorry can't upload a zip with copyrighted material... And this is only a temporary fix, while waiting for the proper VVC, I'm sure you guys will find a solution! Don't give up yet!
Scenery: Lille-Lesquin (LFQQ) by Jean-Baptiste (pilote-virtuel.com)