Hello Sylvester Bos,
You are correct, the version of the ObjectBuilder.dll is the one before the May 2007 release.
All the projects that are part of the TCEK including the Finance Application example are built against this version. As far as I know the only difference is that the new ObjectBuilder assembly has a strong name.
So you do not need the new features from May 2007 - you can use the CAB assemblies that we redistribute with TCEK and use to build TCEK. Still, if you need these new features you could try replacing the references to the CAB assemblies in TCEK to those from May 2007.
If you have any further questions or suggestions regarding TCEK do not hesitate to write.
All the best,
the Telerik team