you can build 16VT from 16V, but there is wery long part list...
- turbo+ parts around it (headers, pipes, IC) + exhaust
- ECU + wiring loom
- at least exhaust cam (you can use Atmo cam with succes)
- modify pistons to lower CR ..yes 16V atmo can be modified, ther is at least 8mm thick bottom
at this moment you have supercheap conversion, which could last long, if it remain on stock power level... even with NA gearbox
but I would not do it.. too much work that better is to sell atmo and purchase turbo coupe...