Chile north to south?

Hello travellers! It is a dream of mine to travel Chile end to end. Can you please offer any advice for the best way to make a north-south journey?

Timeframe would be 3 weeks in December, accounting for approx. 1 week visiting Easter Island (inluding transit).

Perhaps 1 week north, 1 week Easter Island, 1 week south? Please do tell me if that is feasible.

Has anyone done a similar trip, or parts of it?

Gracias por sus consejos!