So I agree 'big' deliberate holes in bonnet and front nose will help air flow and escape of heat. You can see on the attached picture, Scoot style bonnet in FRP, but I have increased the size of the vents to release more hot air whilst driving/stuck in traffic.
The front nose is an Origin Labs design and again I increased the size of the middle vent.
I don't have any pictures immediately available, but under the front nose, the Rotary Works Rad is now in a V Mount with the Rotary Works Intercooler and both are boxed in, but not air tight. I have also left a 2" gap between the Rad and IC to let cold air vent thru' the V mount and hit the engine bay.
The Rad has 2 electric fans and the first is triggered at temps above 85 Deg C.
We did the run to Rotary Stock Holland this month and even though we had long periods stuck in traffic on a very hot day, me and the missus were suffering heat exhaustion in the FD (no air con), the water temps remained 83 to 85 Deg C.
Coolant is towns water mixed with anti freeze from the high street motorist shop suitable for alum engines.