I will try to make something barely feasable (and barely usable) again, also reviving some old project of mine: The game Starfield has an in-game watch displaying various player stats, environment stats and alerts like "Would you please step out of radiation zone so you don't die?". The collectors came with a physical watch (codename LPV6) which annoyingly did not connect to the game (instead being not much more than a normal watch). I experimented a bit with changing that, creating a game plugin to extract the in-game data and creating a separate Desktop application to send the data to the watch. Ultimately I stopped as the LPV6 is very slow to the point that drawing too much at once breaks the BLE connection. Combined with a higher resolution than Pebble (240x240 round, 16Bit color) this was not much fun. I will probably come back to the original watch at some point but this is Pebble Hackathon so let's talk about Pebble.
The Pebble Time Round is an obvious alternative and I hope the OS is a bit more stable than LPV6. I will start with the main screen containing a O2/CO2 meter, Planet time shown as sun "shadow" and current permanent effects (e.g. broken bone, blood loss, radiation zone) and see whether I have time for the other elements. I have taken the liberty to update the game plugin and the desktop application ahead of time (please Bethesda no more patches this week) and checked that I could send some AppMessage from a Windows Application (currently either BL Classic or Developer Connection).
Below I have sketched the screen layout with blue areas being reserved for a compass feature. The curved planet name might be problematic though, so the inner blue area might have to go for something actually readable.