de+t anyday thats coming from me who's done it, pretty easy to do yourself just make sure u research it properly otherwise u will spend big dollars fixing what u could have done right easily.
I've drive quite a few diffrent powered skylines na's and turbos and my de+t is so much more fun than any of the more powerfull ones i've driven.
i would suggest minimum needed is turbo/exhaust water lines and oil lines. Ecu turbo one ppl say is fine i chose aftermarket, fuel pump, crossover pipe with bov, either fpr or injectors and cooler, all stock items will do fine and can be picked up cheap
Have seen all above parts go as pakage for around 1K if u search then upgrade as necessecary when you want like a turbo car.
For that kinda outlay i dont think it quilifyes the stuff around of sell and buying a gtst
pm me if you need any help im more than happy to provied any info of how i did mine,