Obviously the first Babylon station was far enough along to be red. Also I doubt that 1 - 3 were as close to Babylon 4 as JMS implies. But submitted as an example of the only canon thing I could find on the topic. Some fan did some cool fan fiction stations once but I couldn't find those either.
From JMS Speaks archive
Re: ATTN: JMS Question About Babylon 1-3
Posted on 4/4/1996 by [email protected] to rec.arts.sf.tv.babylon5.moderated
"What were the designs for Babylon 1-3. Were they based on the Babylon 4
model or the Babylon 5 model? "
They were designed to eventually become what we saw in B4. None of the
first 3 got much past the early stages of construction.
jms