From 3djoes:

“Did you know there was a second cardboard Cobra base? It’s true! The 1984 Tyco G.I.Joe Electric Trucking set included a hastily drawn Cobra base, and an even more quickly compiled G.I.Joe base, both made of what Kirk Bozigian would probably call “Battle Action Cardboard.”

These sets are very hard to find complete, as the cardboard is even thinner than the 1982 Cobra Missile Command Headquarters.

I searched eBay for years, acquiring a couple incomplete, used sets before finally coming across the one with the unpunched sheets seen in the comments.