We made an overview for you with the specifications of our three beams put together. We believe this will be helpful in your choice what beam to use for your project.
Specifications MakerBeam, MakerBeamXL and OpenBeam with a drawing showing a detailed cross section.
In this post you will find a link to technical drawings of MakerBeam and a number of brackets. A pdf with information on stiffness of the hollow core MakerBeam is also there.