Red as unspawnable?
Beside plants Reforged brings a lot of new blocks in, so you might be right!

For me it's white, on our restarted small server I've just pondered what second ship I'd spawn.

There is a Reforged Creative scenario, I use that for building.
You will need to edit the option file of your creative save to include CPU limit as it is default OFF for any creative.

Did a walk through on creative. Great concept build. Was red though. replaced plots with reg blocks, still red. maybe because creative is not reforged?

Thanks.
I am trying to avoid the usual core+shield+warp+pentaxid-tank explosive package. :D

Nice Design! Not like most arrow/ delta fronts