The inability to construct various vehicles sounds like a recurring issue for some users. I've not experienced it yet, but it may be of note to the devs.
something you can try is to make a new Mobile Vehicle Bay,
and then try to make the cyclops.
i had similar bug on the pc version a little while ago.
unable to make the prawn suit,
making a new Mobile Vehicle Bay fix it.
narfblatUtah, USAJoin Date: 2016-05-15Member: 216799Members, Forum Moderators, Forum staff
edited November 2018
Sometimes a mobile vehicle bay can get messed up by bumping into it too much on its way up or trying to climb it before it reaches the surface. As you found, making a new mobile vehicle bay tends to fix the issue.
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and then try to make the cyclops.
i had similar bug on the pc version a little while ago.
unable to make the prawn suit,
making a new Mobile Vehicle Bay fix it.