Scale is SUPER important in this game. You've got to feel like you're piloting a massive machine, and everything else needs to feel like it matches in terms of size. Right off the bat I've decided that one Blender Unit = 10 meters. This means the test mech is 19.83 meters tall, 13.96 meters wide and 9.13 meters deep.
The above image shows the scale of Test Mech v2 and how it compares to the height of an average human male (1.7 m) and Seneca One Tower (161 m).