Okay, this wasn't intuitive but I discovered by accident
If you are making a Player Character Robot and want to be able to work with the Robotic Mods, it is this simple:
Go to the Configure Hero menu.
1. Select SciFi Companion
2. Check the box for "Show Robots"
3. Select the race "Construct"
And Bob's your uncle, the Robotic Mods tab shows up for your PC.