This miniature model (used for filming scenes featuring the full shots of Skeletor's barge) was auctioned off a few years ago through "Profiles In History". It is constructed of resin and plastic elements, and measures 61 in. long x 34 in. wide (at wing tips). This barge/troop transporter was designed by master illustrator Ron Cobb and built by the Boss Film modelshop.
And how it appeared in the film: