kinda strange, but anyway.........that sorta sh*t wont come in kits
for auto->manual you'd need gearbox, flywheel, clutch, master + slave cylinders (master has booster which you'll need vacuum box thing for if you wanna use it, or can just have a heavy f*ck off clutch), clutch lines (pipe + hose sections), manual pedal box setup, shifter and any centre console change, clutch fork.....hmm that's all i can think of right now. you'd also need to short the park-neutral switch so the ecu lets the car start.
re switching drive, i can't see the point - they came in both i think (america got them, yeah?), so would be easier to just start with the right car. otherwise you'd need the obvious dash and stuff, the loom would need some playing around with (maybe effectively flip it over in the cabin and it might work), steering would need switching over or something i guess. afaik the holes and stuff in the firewall will be in place but plugged up (like a lot of cars).
that's all i can think of, but i'm sure there's more to it than that. auto->man isn't THAT hard on its own though, i've helped a mate do it before.