You can really only source some of the parts from other cars. You will need to invest in a good manifold. Cheap ones crack, even break.
I bet you can get away with a 14b turbo off a 1g dsm. Many people will probably disagree but it's gone into the 12's and you won't be boosting much. Then you could use the o2 housing and wastegate off of that. That would be about $150 and that will be the "critical" parts of your system, meaning the ones you need. Now a bov isn't necessary but is recommend, you could again go with a 1g dsm valve for about $50. Even a dsm sidemount intercooler for about $50. Injectors, again dsm ones will work 450cc-$50
So for $300-turbo, wastegate, bov, injectors, intercooler. And again, all these parts have done 12's on a dsm. Well, i'm not sure about injectors, probably not.
Outside of this, everything will need to be custom. You will need to make your own IC pipes, oil feed and drain, etc. If you can weld, this can be cheap. If not, it could get costly, depending on local welders.
Then you will need tuning. Many options. But, this is by far the most important part.
OUtside of that, you need an fpr and fuel pump. Then a way to get everything to your exhaust.
I'm sure i left something out. I'd say you could do this for under $500, with tuning aside. Then whatever you use to tune, add that on top. I do not recommend you go with an FMU, that would be my main advice for tuning.