thank u all for the comments...
based on ACE comment now I'm on a crown style, something like this:
At least I will see some part of the ties... only problem now is to choose the fall protection mounted on extensions from the down side of the plank, maybe wood, fishing line, Enamel Insulated Copper Wire (interesting because it is like red wood)...
In my fireplace we have 5" crown but I think for this it is too much...