Ventilation exhaust is via pretty copper cupolas, and by continuous roof peak vents. Each cupola will be custom built by a craftsman. Copper By Design, serving Portland, and anywhere, notes the copper controls moss. Extended roof life will cover much of the copper fabrication cost.
Surely there is a reason soffit vents are not larger. Construction can be thoughtless of ventilation, with negligible flow paths above the soffits.
A porch ceiling at the grand-parenting scene of a nice playground provides much of the entering air capacity. I hope there are similar ceilings around the buildings. I do not accept the lore of the advocates of soffit vents, that inlet air paths must always be evenly distributed. I think air is screaming through this screen, and turbulence cools the entire attic.