Flux 3D build faces

Hello,

I am trying to create a custom 3D geometry in Flux 2018.1. 

Problem appears at build faces step where Flux does not want to build 5 faces.

For modelling I am not using Flux Modeller as it is common to cause problems later in project. Also goal is to have parameterised geometry for later optimisation. So .stp model importation is not an option.

What could be a solution to build such faces?

Attaching the project.

In tutorial such faces are marked with ''Complex face CAD import''. Which in kind odd.

Thanks. 

Best regards,

Rok Hodnik