So, I'm fairly new to Dwarf Fortress, and especially to the forum, so I wanted to start out by asking whether the !!SCIENCE!! that I want to do has been done.
Nether-Caps are special. Magma-safe trees. So my thought is, could you make a nether-cap waterwheel run... on Magma? Actually, this project is almost done (if it works, I'm hoping to have Dwarven Magma Reactor after the next chance I get to play Dwarf Fortress... though a Forgotten Beast found its way into the magma chamber I'm going to pump from, and my military is woefully unprepared right now... he seems content knocking over gear assemblies for now, so I'm gonna throw up a wall to keep him out until I'm ready for him... but as soon as I've taken care of the beast, I should be able to get my Geothermal Plant up and running, it's just bad luck that he showed up right when I'd gotten the nether-caps that I need). So hopefully that all works out, and I'll have word on Dwarven Geothermal Plants.
But I had a couple of other questions that seemed just as interesting. Well, first of all, there's Dragonfire. What if you captured a dragon, incorporated it into your defense, and built its enclosure out of nether-cap logs? Is the awesome power of the nether-cap dragonfire proof? Seems like it should be. Sadly, doing that experiment seems hard... I'll need a dragon to attack, and I'll need to be prepared when it happens.
Finally, I was wondering: if you could get nether-cap high boots, could a dorf walk in 1/7 magma?