I'm in the "process" of gathering turbo parts for my ka24e.
I believe the only real difference in the 24de kit is the exhaust manifold. Everything else should be fairly "universal."
I came in thinking I would spend about $1500 total on parts for my turbo. Well, I think now it's going to be closer to 2-3k. And most of the parts are used.
I know they sell log manifolds on eBay, may not be the best choice, but the most economical.
I would probably just start by learning how a turbo works, if you don't know already, and checking out the turbo forum faq's.
There are sooo many diff ways to set up a turbo for cars it's ridiculous.
Good thing I had the help of a couple nico members w/ many hours of chatting

. I'm still confused as hell, but I figured I'd write a term paper on turbochargers now, hahaha.
Nice start:
http://auto.howstuffworks.com/turbo.htm
Then off to the ka turbo forum. They go into loottsss of detail. Be prepared for some major reading. Learn up on it now so you don't regret later.