I don't think the NA/Turbo distinction makes much of a difference because all the work is done from below in both instances, apart from disconnecting the wires.
It might be worth renting a salamander and draping a tarp over the hood while firing the heater under the car while you work. Last year I had to do some work in my motorhome at similar temperatures and I used one of those Little Buddy propane heaters to take the bitter edge off while I worked. Come to think of it, one of those Little Buddy's under a tarp might be enough to at least take the psychological edge off.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

I have 3 electric 12 volt (has battery clips and cigarette lighter plug) impact wrenches that were bought from Harbor Freight a($20 when on sale around $27 reg price). They are made mostly to be an aid for tire changing but I have found them useful to snatch nuts/bolts of of alot of different things. I even removed a crankshaft damper bolt that had a 250 foot pounds of torque on it (had no way to keep the crank from turning; it did the trick). So I am wondering that if there is enough room and the Hex bit goes in deep enough if this might ease the situation. Since it clips on or plugs into the car battery it would work for someone living in an apartment. It is aproximately the size but a little bulkier than a pneumatic impact wrench. See the pic at Harbor Freights web site.
http://search.harborfreight.com/cpisearch/web/search.do?catPath=All%2BProducts%252F%252F%252F%252FUserSearch%253Dimpact%2Bwrench&currentPage=1&lastPage=6&isNext=true&isPrevious=false&category=&attributeValue=&attributeName=&requestedPage=1

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84 300D, 82 Volvo 244Gl Diesel

A couple layers of cardboard under you is also a good insulator.

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84 300D, 82 Volvo 244Gl Diesel

A few years ago, I replaced a master cylinder for a friend. In return he gave me a Paco Pad. It's a 2" thick, vinyl covererd sleeping pad for rafters. It is the height of luxury for working under the car. The vinyl makes it really easy to slide around and it's like laying in bed.

http://www.riverconnection.com/paco_pads.htm

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

You want a U joint and 1/2 allen socket, extensions are probably not needed. Doing this on a turbo is a LOT tighter than NA or om616.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

You need the extensions to be able to connect a ratchet wrench and swing it. There is no possibility of doing this up against the bell housing. There is also no possibility of delivering the required torque way up in the tight space available at the head of the bolt.

24" of extension with a U-joint is not uncommon to get the ratchet in a better place.

there is a shop that rebuilds starters/alternators and i talked with them today. im going to try to get it over there and they said i could probably get out of there around $250. thats worth not doing it outside to me.

All I know is that the starter bolts dont even compare the the upper drivers side transmission bolt. *THAT* little gem is a PITA.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

I understand, and a friend has done, swap out a non turbo from the top, 20 minutes.

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83 SD

84 CD

I'd like to know how your friend did it. In terms of access to the bolts, the NA is not different than the turbo. 616 has plenty of room but on the 617NA that top bolt is just as inaccessible as on the turbo.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

He didn't go into much detail, but I remembered the 20 minutes part.

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83 SD

84 CD

I took a look; cost a lot of $$$. I am lucky out here in CA where I live it is not cold. I was watching a TV show when I was a kid and one of the Guys was a professional Hobo. He said always find some card board to sit on or sleep on as it insulates well. He also said when it is cold and windy to line your clothing with Newspaper. I have used the Newspaper trick at least 5 times in my life and it is a little noisy at first but as long as the weather is dry it works. Who said TV is not educational.

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84 300D, 82 Volvo 244Gl Diesel