Just uploaded the plugin to the stash. This is an alpha release, and as such not all functionality is supported, and I'm not responsible if it steals your lunch money or kicks your dog, etc.
What's there:
Faders, panning, banking, display text, select/solo/mute, transport, jog wheel. I intend to put together a quick document describing the functionality available, hopefully get that out this week.
What's not:
Number pad, and pretty much any button that is Cubase-specific and doesn't map directly to REAPER functionality. I think this is where the Houston is problematic, and this plugin being useful will ultimately depend on making these buttons user-configurable, but also providing intelligent defaults. This is where I hope to get the most user feedback.
https://stash.reaper.fm/12480/reaper_houston.zip