Using des' excellent instructions for dismantling said kettles (as found down the page in this thread) and after spending some time on the internets, I was left with these bits:
2 x elements
2 x leads with 13A fuses in the plugs
1 x 30ltr polypropylene bucket
1 x Electrim tap
As seems customary, here are some piccies:
Dismantling the kettle:

Elements recovered:

Ingredients:

I then got anal about where I wanted the holes. The angle between the elements is 90 degrees:

Scribe and stanley knife (later followed by half moon file):

Next we turn to the elements. The connectors on the leads I've got aren't that deep so the prongs don't go all the way in. Not wanting to have live mains electricity open to the world a shroud is required so you trim all the plastic off to make it easier. des' solution is silicone sealant tubes. I also found that the second smallest section of a desk tidy is the right diameter, it's not deep enough though. I opted for a tub of wilko's sanitiser. Note also that I snipped the trailing leads and pushed them back in:

Wielding the stanley again you get this, not sure what all the white crud is:

Then I fitted a tap:


I'm going to be using hop bags and hoping that they'll keep most of the trub (yes?) out of the FV. I may get a hop strainer although they don't seem cheap for what they are. I've got a sieve if the bags burst.
Hope to do an extract brew tonight, the test boil went well.
Thanks to: des for the kettle dismantling tutorial and more, Garth for his advice, Vossy1 for wanting enough shiny for all of us and all the others who have gone before me and made mistakes so I don't have to. Cheers!