Hello! Glad to connect with you. I'm afraid I don't have your Cornelis van Boven and Neeltje Poelman in my current family tree so I'm not sure where they connect. To my knowledge, here is Elizabeth's Baas line going back. She was a sister of my gg-grandmother Jacoba Baas Aleman.
Elizabeth Baas DeGroot
Paulus Baas & Christina Brik
Jacob Baas and Elisabeth Holland
Paulus Baas and Maria Mieras
I suppose that you might connect on one of the female lines instead. Let me know and I will send whatever I have that might be of interest. Thanks for responding!