1. Oil tank, yes. I will also have a 1 liter vent can also.
2. Tank is 8qts, but you do not run it full. It is about 6" in diameter not counting the mounts or nozzles. it is around 22" high.
3. I have not routed the lines yet since I needed to mount tank first
4. I'm not pulling the motor to install. Just remove firewall for more access to front of motor. There will be plenty of room to install with motor in.