I don't have his template, but I did make something similar for a recent Infinity tourney. I've never played ME (not much of a computer gamer, really)
Only made up a template for the ends, which was a 12cmx7cm rectangle, with corners cut off 2cm in on each corner.
This gave me a rough 3cm per short side width, and an 8cm top and bottom piece. The pods in that pic are 20cm
long. Most are just cargo pods, but a couple had windows and multiple entry points (and these also had the roof panel come off).