QX410 Vs Q430

I have a few questions..



1. What is the main difference between the two ?

2. Are the screen hinges on the QX machine made of metal like in the 430 ?

3. Are both made of metal (both casing and keyboard frame?)

4. Why take one over the other ?

5. Their 13" versions, QX310 and Q330, are they built the same way, only with 13" screen ?



thanks !