You don't get it, the technician "morphs" into 'Battlemachine', 'Air Ballista', and 'Catapult'.
But you have to click on the 'Build Ultimate' button, which allows him, to build the aerodrome.
Another thing, to build a building, produce/summon units, or morph a unit into another unit you have to meet the requirements, for that unit or building you want to create.
To find out the requirements of something, you hover the mouse over the button of the thing you want to create, and it tells you a few things about that unit.
Hope this helps!