FineScale Modeler reviews the 1/48 scale plastic model sci-fi kit.
For many years, the only models were MPC’s 1/72 scale kit — re-issued several times by Airfix and AMT/Ertl — and an Imai offering in 1/110 scale. There has been at least one resin 1/48 scale Eagle.
The original miniatures were 1/24 scale, chosen for the availability of scale items such as ladders and because it worked well for filming. MPC’s model is half that size, so it scales to 1/48 and is about 22" long.