How to fix this motorbike frame model for meshing?

Hello! I`m trying to mesh and analize motorcycle frame model for static loads. Model is ready (made of solids and weldments) and forces are applied, but i have stuck with meshing and calculation.

Model has two configurations:

- full with slots for weld beads in tail

- simplified with combined parts in tail (now i work with it)

Geometry Analysis shows that model has no gemometry-related errors. SolidWorks version is 2016.

And problems are following:

1) It always fails to make full solid-based mesh for some bodies of model.

2) When i try to make half from solids and half from beams - then i get error that "one or more joint lie inside solid" and undefined bonded contact sets error.

How should i to fix this model for meshing?