how much do u want build?
just forged pistons and rods or...
new crank?
water pump
oil pump
timing belt
gasket kit
valves
valve springs
port n polishing
arp head/main studs
cams
cam gears
bearings
thats just starters
then u need the
turbo, manifold(s), ecu, injectors, fmic, fuel pump, fuel pressure reg, exhaust
now a tune and add LABOUR which is $80-90 an hour for a workshop these days
it depends how far you want to go
but an extensive rebuild say to rev higher, will cost bulk
compared to a basic bottom end rebuild