@lwilliamson
No, you're a bit off here... you can basically launch it anywhere you want, you just have to have ADK for creating the WinPE installed on that PC. For me the most optimal is TOMES server itself, because you need to copy the output files into the TOEMS folder in Program Files.
The drivers are only files, that you download from the Lenovo PC's website and that you put inside the Optional folder of the wie_builder.
Your target here is to create a standalone Windows PE, which has the necessary drivers to be able to utilize the devices on client PCs, which drivers are not present in standard WinPE by default.

TL;DR: your guide is here: https://docs.theopenem.com/imaging/build-wie.html