You should be able to just install a fresh version of Warehouse on TB. Then, from your old system theme modules, download the config files for your theme, menu, and homepage, and upload to the new one. This will bring everything over, except maybe if you have some images in your DB that may need to be repointed or added again.
It's basically the same setup as when you start new and use one of the developer preset configurations. Only this time, you're using your own preset config files. I think he still has a YouTube video out there showing how to do it.