I'm not an expert on higher densities but I would guess 70-75% all the way around.

As far as ventilation goes I would just order forward vent. My current units are all forward vent and will easily spike up exactly like you see in the pictures with a little wax.

Keep in mind that if you want sideburns (especially like in the first pic) you will have to use your own. The bonus to this is that if you don't mind leaving a little hair it will increase the realism of the unit.