Thank you all for the kind comments 
updates are a bit slow, as there's a lot of small details to paint. So forgive me the posting frequency.
Since the last update I painted the welding equipment with the gas bottles and a small tool table.
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Then a kind of gun shield with a toolbox in front.
This will also be the main paint scheme for the prototype. (MagosBiff09 - great minds think alike
)
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And then I did the blueprint on the construction desk 
I admit I'm proud of it.
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Looks pretty cool in the scene.
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Next was the main console - in a wooden finish.
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And the second console in the upper left corner.
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And then it was the first piece of the tank.
The turret attached to the running crane.
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Here you can see the turret itself is already a bit beaten up and scratched, but the gun tube seems to be a new one. No scratches.
It is labeled "Nr. 5 long" and "120mm StuK 55 l/5"
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The chassis got the base coat in the rust protection paint.
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Engine and interior got their paint too.
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And the sign that identifies the project:
"Versuchswaffenträger XII mit Kampfmittelanlage "Skorpion" & Kampfraumverbesserung "Odin".
And the vehicle's nickname "Siglinde".
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Scratches and a bit of wear.
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And incorporated into the scene.
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The driver is observing closely as the turret is matched to the "Siglinde" vehicle 
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Next are the troopers and then some pigments.
After that the real fun starts, when I add the washes and then start painting the highlights and light effects.
I hope you like today's update.
Cheers
Klaus