Outrigger Rust

My Def 90 has got a 3-4" rust hole in an outrigger which will become 6-7" when cleaned back to clean metal.
Its the front nearside, and the back surface.
Access in situ, is impossible. The rest of the chassis `appears` ok........... so far
So what bodywork do I have to remove to get good access to it?
I`m looking to plate it, but if a lot of panels have to be taken off, might as well get a new outrigger.
Is it sensible/possible perhaps to lift the whole body intact from the chassis and do the work that way?
Any thoughts welcome

I would replace it and check the other as well....but thats me. I got mine replaced by a local guy who knows how to weld them without removing anything of note. It can be done but I think he did 2 types of weld because of limited access..or couldn't use a MIG? Anyway, sorted without stripping anything.
http://www.landyzone.co.uk/lz/f7/my-mot-fail-pics-welding-advice-please-97854.html

I only removed the radius arm when i replaced my o/s front outrigger, shouldn't be much different for the n/s? the hardest part is removin the remains of the old one, but it just requires patience new one is handy to stick on with a welder.

Yeah, thanx for the replies guys. Looks like it can be done the easier way.

Helpful link MrJC, I remember it first time round now.
Just wish I lived in or near Bolton!
Oh well, the search begins for a welder like you found, in the Norwich area.