The RAF used this model of the Houchin GPU until the 1990s on many aircraft types of all sizes. They had a Dual lead and 3 & 6 pin square connector for AC & DC power supply. Handy for those airfield diaramas.
The model comes in a one piece and an exploded version. No cable is included, but the connectors are, so use thin wire or nylon thread if required. The exploded model has the option of open doors & cable troughs. 2 versions of each are supplied, one with radiator doors and one with radiator louvres. NEW: added a zip with individual part files for ease of printing.
The size of the of the one piece object is X: 1.36182m, Y:3.5051, Z:1.61943m The Exploded object is X: 4.303m, Y: 2.25413m Z: 1.42876m
Divide the longest dimension by your scale (EG, for 1/48th divide the dimension by 48) to achieve the scale size to print at 1/48th Y will be 0.07302m or 73.02mm Use your measurement in the appropriate (Y) slot in your slicer, with constrain proportions selected. The X & Z dimensions will change to fit the new size.
See the last two screenshots for examples of a 3d printed model and the orientation used, printed at 1/48th scale. Print using the smallest layer size for best results. Make sure that thin objects and undersides have plenty of supports.