The J. Smit yard in Alblasserdam was the first yard in the Veolme empire,which later culiminated in the RSV Gropu ans was subsequently dismantled. Newbuilding has ceased there ages ago and I doubt that anybody who was involved in that yard is still alive. There could be archives somewhere, but it would be difficult.
De Merwede Schipyard is still part of the IHC group, but their activities have been reduced significantly since 2015. This is IHC's websitehttps://www.dehoop.net/