To be honest, It's really hard to build a decent looking articulated Transformer from just a single LEGO Marvel Mech set.
During the past 2 years , I had tactfully chosen Marvel Mech sets with more potential for such purpose. And Captain America Mech armor set here was not in my to-buy list. This is because of the presence of big shield from this set... leading to lesser potentially small and useful parts.
Anyway, I finally purchased the set after one of my youtube viewers requested a TF from it. Consider this a fan service I guess!
Millennium Falcon is THE space ship of Han Solo, one of main characters in the original Star Wars movie franchise.
I actually struggled for many days thinking of an alternate mode for this Transformer. (snail, turtle crossed my mind )
Notice the rounded side, mimicking a hatch of sorts found in the actual Millennium Falcon.
Due to the freely rotating shield connection capping this creation, I didn't bother to align the star motive to be symmetrical to the ship. This lack of symmetry is very apparent when viewed directly from above.
Initially the head would've been 1 stud wide, but I've decided to make it bigger to allow for stronger connection to the body.
Building Instructions in the form of a video tutorial , is located at the bottom of this page.