I've retried yesterday and it works but you have to specify, also in thermal mode, a contact region between pieces since you have a contact region in structure mode.
The problem is the good design of the link of the beam (points) with the solid geometry, so you have to make some surface regions and rigid links.
I've done a little simple model for analyze the differences between a model modeled with a fastener and a link made with beam.
There are differences around the link, caused by the rigidity of the link (I've put a rigid link); from here the importance of the design.