Whilst the body is off, a simple mod you may want to consider is to drill out and replace the turbo studs with bolts. Details can be found if you scroll down the post from the disco3.co.uk forum.
DISCO3.CO.UK - View topic - My Disco 3 revival thread!
Not that you will be wanting to change a turbo out, but with this mod it is claimed that it makes it an easier job in future without needing to remove the body.
And of course any other preventative maintenance that can be done at the same time, I would do now.