Make reactor produce 1 extra unit for free

[Kabel]

I am struggling to learn the editor and I am doing some experiments in order to try to learn more. Right now I try to make a reactor produce it´s extra unit for free. There is no need for an extra queue. All it means is that every unit that is produced from the barrack/factory/starport becomes two when finished. You pay for one, you get one extra of it´s kind for free.

I can not get it to work really.

Any suggestions, hints, tricks or ideas to share? How would you do this?

 

[Dr Super Good]

2 approaches.
1. Change the train ability to one which trains 2 units at half the price.
2. Script a trigger to spawn an extra unit when the barracks creates a unit and has a reactor.

1. Might require you to morph the actual building in contact with a reactor. 2. requires you be very specific to avoid unnescescary overhead.