Add TD structures and units to red alert

[bask185]

Playing the mega compilation, I was supprised to find out that some missions had structures of TD ported to red alert. I am wondering how I can do the same? Is there a simple guide or a topic about this? I thought it would be neet to add the old power plant and the comm center instead of radar dome for the allies (would I lose the radar screen?). And can I work with this in RAED?