Hi
As the picture shows the installation of the TP is straight forward , you need to make 4 standoffs 118 mm long, a forward gear box mount
And on the inside of the fuzz you need to install 2 mounting brackets to bolt the turbine down.

Regarding the top vent this serve's two purposes it allows you to slide the turbine through the hole in the firewall and then to bolt it down
Onto the wooden rails, also it allows fresh air into the fuzz to feed the turbine

Hope ths helps


Ian