A320

I would like to start building an A320 simulators any ideas for online-shops which show prices etc. or any sites with dimensions easy to understand

have a look at http://skalarki-electronics.eu/en/, recommended by a lot of people.

Skalarki for electronics (I have an MCDU on order).

And flybycockpits - http://www.flybycockpits.com/ for other parts (I have a side stick on order).

I highly recommend Skylarki. Support is second to none and very happy with the way my kit works. Sadly my gear is a bit old and I'm told the latest kit is even better.