I would have persevered with this but the tweaking was a nightmare. I think I have seen some very old posts about this tweaking problem with AR1 and it was recommended that when you build a level like this that you break the chain of plates by putting two anchors next to each other. At present the Beta 1 has the same collision response for a material connected across anchors as it has for material that is not connected to anchors. Peter is aware of this and will correct it in Beta 2. Until then it may make the tweaking a bit less frustrating if any chains of plates or bars in a level are seperated by putting in pairs of anchors so that no part of the chain that is likely to have anything build onto it in the solution is connected to anything else.
My solution has a launcher in it, every adjustment I make to the catcher changes the behaviour of the launcher