Hello Groentas,
thanks for the explanations and other details.
First of all, I doubt that the base car (911) has been "as it is" in duty in the former DDR to be used by officers. DDR has been socialist and probably would have never ever bought a Mercedes Benz for their Army... (Russian Kamaz, UAZ or IFA would have been more probable in my opinion...) but that does not really matter for you.
The shelter seems to be fixed with container locks and should be easily removable to another base vehicle (?).
The 911 is a "so and so" car in my opinion. It is loud, not too fast, but it has something - the "smile in the face"- which no other car has. Either you like it or you dont... Newer 1017 or alike are certainly "better" in much senses. But a 911 you can repair yourself, lets say 90 %, with a big tool box.
To the engine: Replacing the front simmer ring and on the transmissions / differentials is not the real big issue. Much more critical is the sealing between the engine and the clutch (in German Borgmannring). Have a good look that this sealing is OK, as you will have to take out the crankshaft to do this job properly (not only the oil pan).
Upgrading from 110 HP to 130 HP according to my knowledge takes a different injection pump with bigger pistons and may be different injectors (?). This only can be done on the OM 352 engine, not on the older ("Vorkammer") engine which had no direct injection. Your engine looks to be a 352 , but I can not see which version.
To the gearcase: Yes, there is a "gap" between 4th and 5th gear, this is right. If you lose momentum in 5th on a long flat or steep hill, you will creep up with ~ 50 km / h or so, depending on how much you are willing to make the engine suffer at high RPMs.
In real life on German highways for me that was not a real problem - but I only have roughly 4000 km experience on my 911.
I have been on a 4 x4 "playground" (Saverne) last year and what this car can do is absolutely impressive.
You must be aware, that you are driving a kind of an oldtimer and treat the car accordingly. If that is "yours", then you will get happy with it. If not, look for something modern.
Anyhow, you will have to do some noise sheielding jobs in the cabin - it is pretty loud while driving 80 - 90 km/h....
Hope you will have fun looking at the car.
Ask how much oil it eats and look at the air compressor (for thr brakes) and the condition of the wheel brake cylinders and the master brake cylinder.
I have been searching for over 2 years to find mine in acceptable good condition and for an affordable price.
There is much junk around.
On one of the pictures I have seen some rust on the edge of the right wheelcase. The wheelcases semmingly have been cut out not very professionally (the circle seems not perfectly round) in order to fit in the big wheels.
Look what axles are in the car. For me it is an absolutely "no go" if the truck can not swim along with modern trucks on a flat highway. 95 km/ h in my opinion is a must.
Forgot to say: The front window for the A type 911 is not available any more from Mercedes.
The rims which are on the car might tend to break. There is another thread about this here.
http://www.allrad-lkw-gemeinschaft.de/p ... elgenbruch
You mentioned you want to go to iceland - so you better take 2 spare tires there. Going without one at all is probably not a good idea. We have a story here in the forum where stones have cut some tires an he had to fly in spares...
Best regards,
Udo (DL 8 WP)