I am not familiar with that thread but it would be possible using just data. Since LOTV the Launch Missile effect has the Effect: Periodic Effect field which could be used to launch the relays using a throw driven mover. The actual deployment pad would use a Launch Missile effect that uses the pad itself as the ammo unit and a parabola driven mover.
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Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?