I had a coach trying to pull this on me (remember, the level of education about football here is not like in USA).
He told his tackles to be off the line and put their hands forward to 'break the plane'. After a few warnings to the tackles, I just started flagging them for it. The coach flipped at me so I send him the rule after the game (quite politely) as it was written at that time. He never referenced it again, but was not very friendly to me after that...
Even if the linemen DO line up and place their hands forward to be breaking the plane - you can bet that towards the end of the game they will not get the arms fully extended on every down, and will forget - making the formation illegal.