Pardon my kindergarten like drawing because I use finger to try on my screen.

1. the 2 outlet from rocker cover I use a T joint and a brass reducer to make this. The right side rocker cover breather hole is bigger than the 1 on left so you will need to different sizes of hose then you will know how to joint them up with the T joint and the reducer. Then I pull a single hose from the 2 joined ones into the OCT and the OCT outlet I just let it vent into atmosphere.

2. How about the hole at the intake pipe and at the intake manifold? I just plug them off with an silicone end cap where you can find in performance shops or spare part shop. cheap stuff only.

Wahla you are done. 1 more thing, make sure you mount your OCT away from the hot engine as far as possible or a place away from heat where the oil an cold down and pleace the OCT lower than your rocker cover so the condensed oil will flow into the tank..my when clean has a lot of oil inside

For your OCT you can use tupperware to make also. drill 2 holes into the side and put 2 male nipper into the tupperware and connect with hose. good tupperware..that can stand oven mia