I made some constructors of 25 movements points. Everything worked great for many turns. Then, the United Planets voted for a **minimum** constructor speed of 5.
So, what happens?
In the turn of their fabrication, the constructors have movement of "25/5" and zip across the galaxy. After their first turn of the life, the movement of the constructors drops to "5/5". It seems I will have to wait 150 turns for the minimum speed edict of the United Planets to expire. Rats!