Sport Pilot,

For point one you are right,
In my Orion there is a line mounted from the crankcase connection to the bottom of the plane to allow the oil to go out. In the line there are two restrictors, between the restrictors there is a T for the upgong line to the pump.
The pump is mounted between backside engine and firewall. Engine is mounted upside down.
Point two I don't need because I use a "Cline like" regulator in the combo.

Thanks Cees