Fortunately I got the advice that this ship was one of the Emergency Fleet Corporation Design 1020 Lake A ships and there is a 3D printed model:
EFC 1020 'Laker' WW1 Freighter 1/600 & 1/700
But I have not found more informations. There are some useful websites:
But in the list of EFC 1020 Lake A ships Chantier was not included - but her length and appearance would fit.
Is there somewhere a more detailed list of these ships? Including e.g. re-namings? Or more information about Chantier?