Actually, nevermind, the tree-hugger caravan arrived and reset the quota. They also raised it to a maximum of 108 trees cut.
EDIT:
Not as much an update as a set of goals.
My primary project right now is the automatic minecart railgun. I will use a enemy-detecting contraption of my own design (that works on trap-avoiders) to activate a roller system that fills a minecart with water, raises it to the top z-level using spiral track ramps, accelerates to 50k, then lets it roll down another spiral track ramp to the very bottom, hitting a fortification at about 140k. (Is that enough? I hope it is.)
My secondary project is to pierce the caverns. I would create a downward staircase through the aquifer, along with a sort of "cavern hub" building at the surface. I would like an exception be made to the "no underground buildings" rule by allowing placing cage traps in the caverns, but disallowing any mining or any other kind of building.
My final project is to get magma to the surface. I'll have to completely dig out a 1x4 area all the way to the magma sea to ensure that the whole construction is "light". I'd then have to go through, installing floors and pumps where needed. I probably won't finish this in time, so whoever is my successor should feel free to continue it.