there is a nice wr450 featured in transmoto magazine at the moment
if you want a look at the first page of the article, it can be found online - this works right now, not sure when it will stop - presumably when the next issue comes out;
click on the "issue no. 4, digital sample here" on the right side of the page. scroll through a few pages until an adventurised 450 comes up
it has a good set of mods;
- 20L front and 10L rear safari tanks
-new exhaust to suit the rear tank hanging low
- small windscreen
-cush hub rear wheel
- small rear rack
- etc etc
the good interesting mod is that he has added an external oil reservoir to bring oil capacity to 3 litres - they think good for 4000km between oil changes, permiting good long desert runs. the next page of the article in the magazine (not visable online) showed a basic diagram of the oil circuit and how he tapped into it etc. The reservoir was built into the custom bashplate. the weird bashplate and a few extra oil lines can be seen by those with a keen eye at that link above.
apparently he made a few bikes like this for his mates so they could do trips together.
the mega oil capacity idea was quite interesting i think.