Many thanks, Ernst, highly interesting !
Indeed developing a model for V/R variability in case of VV Cep needs more measurements. Therefore the upcoming campaign for VV Cep is very important. Additionally,in case of other eclipsing binaries possible ideas applicable to the VV Cep system can be transferred. Most recent concerns a 3D modelling of the accretion disc in an eclipsing binary, here V1239 Her :
I wondered also if VV Cep has already been subject of asteroseismologic studies/recordings, as spectroscopy is limited to the line of sight observation.