This early park postcard features an artists rendering of the Fort and Rootin' Tootin' Rip Roarin' section.  
Notice in this stylized drawing the depiction of guests on the catwalks.   
  This artists rendering shows the sixth tower for the back corner of the Skyride Station which was planned but never constructed.   Also note the depiction of the Runaway Mine Train emerging from a tunnel that appears to run under the lake.  
This scan from the 1976 poster map of the park offers a fairly accurate depiction of the building.
This 1974 postcard shows the Fort before the cannons were installed.   Note the absence of the additional Skyride tower which allows extra clearance on the "B" side between the Runaway Mine Train and the gondolas passing overhead.
Another 1974 postcard.   Note the wide grassy expanses and the small wooden fence originally surrounding the lake.   Later the path would be widened and a stackstone wall would be erected along the lakeside.
This postcard shows the cannons now in place as well as the additional Skyride tower.   The fences has been replaced at this point with a less ornate post and rail fence.
The quintessential picture of the Fort and the Western section of the park.   Note the weeping willow tree growing up under the Skyride "B" line.   This tree would grow every season and need to be trimmed by the landscaping department constantly as it began to scrape the bottom of the gondolas.
This postcard from the early 90's shows the "new" Skyride cars in action.   Note how the weeping willows have grown over time and how the one under the Skyride has a flat top from pruning.
As an icon of Great Adventure, the Fort was prominently features on many early souvenirs.  This mug has one of the most common drawings of the Fort used on souvenirs, and features great detail and accuracy.  
These steins were another park souvenir featuring the Fort.   The images are done in a deep relief, and the flags, Skyride and Runaway Train cars are all highlighted with a hint of color.   Many souvenirs featuring the Fort had the name "Best of the West" on them.   The name of the restaurant became synonymous with the park's Western section.
One of the more rare souvenirs of the Fort is this blue plate.   The artist clearly used this postcard picture, since the flag on the front tower is missing, and even the glare on the canvas of the Super Teepee and the reflection of the Runaway Mine Train are identical to the original picture.
One of the more unique items which was a staple of all theme parks in the 70's was the brown glass mug with wood and brass handle and wrapping.  This one features a simplified drawing of the Fort, and the Best of the West caption.
This souvenir mug from 1976 has the photo realistic version of the Fort.   On the side opposite the handle is the early version of the park's rainbow logo, pre-Six Flags ownership.