I've purchased a new A/C system for my TR6 with an eye towards using most of the components to put A/C on the 2000 as well. The kit looks good; we'll be trying to install it on the TR6 at the TCOC Tech Session at Dave's Place the first weekend in April.
Here's a link to the A/C system, if you're interested. I had previously found a Vintage Air interior unit that I think will fit in the passenger side footwell on a Mk. I, and coupled with the underhood components from this guy should work pretty well. Once I get the TR6 system up and running I'll go ahead and purchase the components for the 2000 set.
Can't wait to get started on the fenders. I had actually taken today as vacation to start on it, but I ended up laying down all day as I was seriously "under the weather". Hopefully tomorrow will be better!
This is a picture of the underhood installation on a TR6 (not mine, yet). Since the unit doesn't use either the extended water pump OR an additional pulley on the crank, I have high hopes that it will fit in the constraints of the 2000 engine compartment.