The Mobile Launcher

The Mobile Launcher includes the Launch Umbilical Tower and the Mobile Launcher Platform, although the MLP was not refered to as such until the Shuttle era. For ease of reference and division of photo galleries, we'll use the LUT and MLP as separate subjects.

• The Launch Umbilical Tower
  

Dimensions of Mobile Launcher Platform

• Length: 160 feet
• Width: 135 feet
• Height: 25 feet
• Height of pedestal mounts: 22 feet
• Exhaust opening: 45 feet square
• Early photo of ML before completion, from NASA pub."Moonport"
• Drawing of top of MLPThis one's kind of rough, I'll clean it up later.

Dimensions of Hold Down arms

• 9 foot 9 inches long, 6 foot 4 iches wide, 10 foot 5 inches high
• Drawing of internals of Hold down arm from NASA pub. "Moonport"
• Photo of Hold down arm from "Moonport" It is missing the blast shield on top

Tail Service Masts
There were three of these connected to the base of the S-IC. I don't have the dimensions yet.
Drawing of Tail Service Mast from "Moonport"