Looks great. The blade on that trap looks fine as it is - like you say, don't want too many polys.
The only other thing I'd mention right now is that the bottom of the lift chain is too 'long'. It stretches too far along the ground. At the bottom of the lift the chain goes to flat pretty quickly, with a brake section immediately before it.
To see what I mean, look at the Typhoon (from Bobbejaanland) track that comes with No Limits.
A final help for today, this is a really good site for SAW pics:
http://projectdylan.co.uk/
Here's what I was trying to find the other day, the official queue line plan:
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