Andy,
Great diff pics. Having had a look, I personally wouldn't bother stripping it. I say this because, first, it looks good enough, and second, you'll probably find - as I did - that even old rubber on these is actually fit for purpose. If you strip the diff there's a chance - albeit a small one - that you may not get the proper torque on the bearings when you put it back together. If it all seems sound and the diff carrier arm is tight with no play, I think it’s enough to replace a few easy bushes, etc and put it back in. Of course, if there’s play and it doesn’t feel tight, you’ll want to strip it. So for me, it's a no brainer: don't do it unless you HAVE to, rather than just WANT to.
I would add the following comments based on your pictures:
Diff resto 23: This bush is very hard anyone, but it’s easy and cheap to replace. Replace.
Pic 22 and 19 – this is the only area I’m slightly unsure about, as I can’t really see what the photos are showing. The rubber ‘donuts’ sit over the bronze bushes, presumably to keep the grease in and grime out. You’ll need to get that area a really good clean and put fresh grease in.
Pic 20: These trailing arm bushes look pretty tired and I would replace them. The bolts can be a bugger to undo, and you may need to replace them, also. MB does a kit with all the parts. Read the thread I posted that’s below here some way about how to put these back. Don’t use any lubricant or slip (talc is OK) because they shift a little too easily once the weight it back on. You want them looking like they do now. The circlips aren’t that hard to get back on. I’ve posted a picture showing a method in the thread below which uses a vice and a few bolts. Piece of cake.
You should also replace the large rubber donuts at the front of the trailing arms in Pic 25. Note that the arms are ‘sided’ – ie different for left and right.
James