Also, If a Stirling engine is flashing green, is it about to blow?
No, not even close.
Blue is cold, green is warm, yellow/orange is hot, and red is in danger of exploding.
Specifically, those correspond to 0-25%, 25-50%, 50-75%, and 75-100% of the engine's internal MJ buffer filled, respectively.
So don't be too worried until the engine turns yellow constantly, and doesn't flash. However, even flashing yellow/red (as redstone engines do) won't explode until whatever they're powering stops accepting power.
Flashing engines are hovering between two color levels, and will continue hovering there until something not entirely the engine's fault changes- either the engine runs out of fuel, or whatever the engine powers stops accepting power, or another engine powering it turns on, warms up, or runs out of fuel...
In any case, redstone energy conduits will never stop accepting power, so the only way to blow up a stirling on those is to go overkill with daisy-chaining (i.e. five industrial steam engines powering one stirling could be a problem).
Also note that no engines other than stirling and combustion can possibly explode. Ever. Except maybe Redstone engines, if you do something terribly wrong, but even then it's a very small explosion, from what I've heard. I do believe that you've been working on setting up a tree farm/biomass/biofuel production facility, so biogas engines would be a good choice. Just supply biomass and a little lava, and you've got yourself an engine that's almost as powerful as a combustion engine (5 MJ/t as opposed to 6 for combustion, or stirling's 1) that has no risk of explosion.
Edit:
Does anyone happen to have links to a Direwolf20-esque mining well system that doesn't use computercraft at all? (I'm talking Redpower blockbreakers and deployers). Right now I'm trying to set one up and getting stumped.
Not I... although Direwolf did mention somewhere that someone had built such a setup... Apparantly, the mining wells were not connected to the frames, and when the frames moved, the breakers were suddenly in position to break the wells. Good luck not sucking the wells into your sorting system, though, as they will most likely deposit stuff into the deployers. You might be able to do something with routers, and turn them off during deploying.
However, CPW did say in a recent Direwolf SMP video that he would be making mining wells moveable in the near future. Probably 1.5, methinks...