i'll answer in english...thats easier for me...if thats a problem i will try in german too.
For starters the cockpit sonic SSTD is the same as the FDS one, the price difference has many reasons. The FDS price is 2299 dollars. When you order it yourself you will have to add shipping costs to that (couple of hundreds dollars...its a heavy thing) and above that you will have to pay import taxes (because it comes from outside the EU) and Mehrwertsteuer.
If you add all that you come to about the same price Matias from cockpitsonic is asking. He took over that part for you.
Cockit sonic also has their own development dual seat trainer.
Then to your other questions:
You will need much much more. The SSTD is merely a MDF frame with the panels and switches. You will have to add:
* MCP
* EFIS
* Landing Gear
* CDU
* Interface boards
* Screens
* Computers,
etc.
As far as i know you will have to arrange the PM software yourself. Registrations keys for PM are hardware dependent and unique to your computer. If im well informed CS is not a PM reseller.
You will need the project magenta Boeing glass cockpit suite for:
PDF
ND
EICAS
EFIS + MCP
CDU
this is around 500 euros for the captain side.
Add another 200 something for the F/O side
You will need PM systems for the overhead logic.
Around 150 euros if the price hasnt changed recently
If you have any more questions feel free to ask (either in german or english)
Stef
www.boeing737ng.com