A basic Stirling Generator able to run on the choice of either solid or liquid fuels. Intended to bridge the gap between the early game and a turbine, this would be a source of energy for things like Powered Rolling Machines so it isn't quite so frustrating to get the large amount of plates required for those machines. The major disadvantage of it compared to a steam setup is that while it would still need a warmup, it would get diminishing returns from heating up to a high temperature, meaning it isn't nearly as efficient as a Steam Boiler.

I still think a small steam engine would be more interesting than a Stirling Engine.

why not a single-block dynamo?