It's well easy. Can be done for peanuts. Buy a Mk4 EFi XR3i and get all the stuff you need from that.

Then get hold of an OFAC/OFAB ecu and map sensor from a fez turbo, an inlet manifold adapter plate and a sierra 1.8CVH CPS sensor and your singing and dancing. Then break the rest of the 3i and recover your costs.