Unfortunately there seems the be quite a bit of conflicting Information in regards to Dropship configuration and capabilities. That said pretty much all sources and artist's depictions agree on the following...
- All up (Wet) mass: 3500 tons
- Dimensions: 81.5 x 81.5 x 78 meters
- 4 Landing legs
- 4 RCS pods arranged equidistantly around the vessel's "equator"
- 2 Mech bays, one atop the other. Aerotech: Drop Ships and Jump Ships mentions that the upper bay is 50 meters in diameter and accounts for most of the vessel's carrying capacity as such I will assume that the upper deck larger than the lower.
Placing MWO's Atlas along side, the scale appears appropriate. My first step moving forward will be to block off the spaces occupied by the mech bays, landing gear, engines and other major components. The intent is for the model to be fully riggable, without cheating.
Atlas + Gantry taken from MWO game files
For a sense of scale, that figure between the Atlas' legs is a basic 1.8m tall human.
Looking at the same scene with in orthographic view with a reference image in background. The scale of the Atlas itself (17m x 10) feels appropriate but I suspect that I will have to resize the gantry or design my own to make it fit. at 26 meters It is simply too tall to fit within the confines of the ship's hull comfortably.