Given unlimited time, money, & storage, the lion kingdom's favorite mecha from the series was the alpha fighter & the cyclone in season 3.
There are a few Robotech toys still being sold, manely from the Macross series. There's only 1 alpha fighter, for a lot of money. They're of varying quality & not animatronic. The TV show was subsidized by selling toys, so season 3 obviously flopped for them to be selling no toys for it. Something that transformed autonomously in front of your eyes would be a hit. Not sure it could transform & walk, but it definitely couldn't fly.