[@Willy Vereb]
Yup, had several ideas for the setting, between medieval fantasy, modern, retro, etc. Felt the option chosen would be fun, since as far as I can tell, it hasn't been touched upon. Usually it's the 40s, early 20th century or 19th Century for steampunk/dieselpunk settings. So why not go a bit further in time?

As for Fusion Reactors, sure thing :)