SpaceX completes stacking Starship for 1st orbital flight. Elon Musk says it's a 'dream come true.'

• SpaceX on Friday completed stacking its Starship rocket for its first attempt at orbital flight.
• CEO Elon Musk shared photos of the 400-foot spacecraft on Twitter.
• "Dream come true," Musk said.

Elon Musk on Friday shared photos of SpaceX's Starship atop a $4 rocket booster before its first orbital flight.

At about 400 feet tall, it was the biggest rocket ever constructed, $4 reported.

The construction took place at SpaceX's launch site, Starbase, in Boca Chica, Texas. Musk's photos were the latest in $4 he's posted showed the spaceship being stacked together.

-Elon Musk (@elonmusk) $4

CNBC's Michael Sheetz asked Musk what it felt like witnessing the milestone.

"Dream come true," Musk $4 on Twitter.

Musk said there were four $4 SpaceX would need to complete before its $4.

In the next two weeks, the company needed to add "final head shield tiles," add "thermal protection" to the $4 complete work on "ground propellant storage tanks," and add a quick disconnect arm to the top of the spaceship, Musk said.

-Elon Musk (@elonmusk) $4

The first $4 of the Starship rocket was expected to last around 90 minutes. SpaceX planned to launch from South Texas and splash down off the coast of Hawaii, according to a May FCC filing.

The spaceship was built to carry both crew and cargo on long-duration interplanetary flights. It's expected to go to the Moon and eventually travel to $4.