The input protection diodes are optional to install so in my mind it's fully assembled. Mind you I'm not an official 41hz person.

I wasn´t aware that they were optional, then I fully agree with you Saturnus.

So I can basically connect it as it is right now?
Can you tell me what they are good for? Should I install them?

I´ve been looking at the assembly instructions but can´t really make much sense of it (reason I bought assembled) , it seems like on the "map" for construction the diodes are different but the ones I got all had the same numbers on them.

They make sure the inputs can't be overloaded above 5V P-P... Not a bad idea, though some people claim it influences the sound. I doubt that as this also works for Firwire ports etc. If there would be any effect then surely a high frequency signal should suffer from it most....

Have you tried searching in this forum for "input protection diodes".
There are a number of threads discussing the pros and cons of using these.
Personally I would not run an amp without them, but then again I am older and my propensity for risk as decreased a lot from my younger years.

Scratchy, I would, if I knew the name of them :) Now that I know their name I will spend some time reading about them in the forum.

This case can be closed.