T o use a catch tank, would I need to redirect breathers away from plenum and into catch tank?
Basically bypassing plenum preventing gases going back to the intake?
And loosing any facility for the crank case to run at negative pressure. How will this help?
Do you always answer questions with a question?
I was looking for advice, not cynicism. I've already gathered that you're against the modding/improving of original set ups.
Hold up, am I in trouble for asking questions? On a forum?
Shall I quote your stroppy response from earlier? No that would be childish. 
Seriously now. How does it help? 
Not at all, I'm not here to argue and bitch with anyone! And I respect/accept some of ur earlier posts.
I asked a question and u replied as if I had made a statement.
How does that help 
Yes yes, very good. But again, how does removing vacuum from the crank case help ?
Why consider it, continually, against all advice? I am intrigued.
By your own rules, sarcasm etc isn't allowed. So come along, straight answer please.

The dip stick doesn't leak because its held in. Anyone who's checked the oil on an omega would know this.
You could, of course, fit metal vectra cam covers, but if the breathers block where will the pressure go? And no it won't make a rocket launcher out of the dip stick with the bonnet open. Which is disappointing, granted
