do a search on here for "twins" in thread title. There are at least a few build threads that guys have posted. Study the pics of all the kits you see pics of. Make sure you can identify and picture where each piece will go.
I had to do quite a bit of "massaging" to install the II kit on my truck. a little tweak here and there, loosen this, tighten that, etc. I'm not a mechanic but I'm not afraid of some work, and it took me 4 days just to install the kit. had to make a few trips to the store etc. There are lots of guys who can do it faster, but I took my time and ( fingers crossed ) haven't had any trouble.
All I'm saying is.... consider what your time might be worth. There isn't a lot of money left on the table to save if you buy all the parts yourself and you'll lose if your time is worth anything. A bad weld that lets a piece of slag or whatever go into your turbo will be very bad.
Having said that, good luck and post up any questions you have! plenty of knowledgeable guys on here to help.