difference between a Manuel Contreras II C 5 &C7

[Johneg]

Hi All

I have a couple of questions on the Manuel Contreras II C7 :
1. What is the difference between the C5 & C7
2. The Manuel Contreras II C7 compared to other classical in it's price range
3. Best strings for the C7
4. Sound and construction quality of C7
5. what is the best way too add a pre-amp/pickup

Thanks in advance

John G