Can I beat the Scrin campaign on hard without using units in base building missions?

3 base building missions. No units allowed! Can it be done? Music by:    / @intersonicsound   Buy the specific music used at: https://intersonic-sound.itch.io/symp... twitch:   / immortalgeorgegaming   0:00 Intro 0:21 London 3:17 Croatia 12:36 Threshold 19 30:28 Outro