I've been sitting on starting a Riverrun 2.0 of sorts for a couple weeks, but
someone keeps releasing content which may be useful to the fort in question in some fashion. Can't imagine who that'd be.
I was going to do dwarves, of course, though limit myself far more by way of Terrible Weapons and decaying food, among other things. Kind of hoping to see The Wild Hunt in action as well.
I also kind of agree with Vonsch on the kobold life expectancy; in vanilla they can live to be up to 500 years old, but generally famine or violence claims them well before they even reach thier first century from what I can tell (living in caves that large predators like to nose around in probably doesn't help them in that regard for vanilla.)
As to sieges.... Honestly, there's not much point in the fortress defense races anymore. Too much competition from the other playable civs/possible bad guys to begin with and distance being a factor means basically "pick who you want to fight" and park your happy ass between the biggest population center you can and any other viable targets. Not helped by them basically being at war nonstop and with the newer version's use of actual population counts rather than "Do they still have a site? Okay then. Here's 900 free dudes" and travel time means even if they survive worldgen, it's often with too few numbers to be able to mount a siege at all, or survive the "living" world. And that's assuming you set the seige/attack requirements to the absolute lowest - still barely anything at all, if ever, at least in my experiences as of late in vanilla.
In a way, it kinda puts a damper on those civs that relied upon steady streams of enemies for thier tech trees or population growth in 34.11 (Orcs, Succubi, and Warlocks spring to mind.) It also sort of ruins any point in weaponry-related tech trees/powers, since it will be rarely, if ever, used if you settled the "wrong" place unless you go digging into the spires (Which frankly takes a lot of the fun out of the game in general for me - I got the most enjoyment out of fighting actual dwarf o whatever battles and seeing my soldiers' titles and kill tallies grow and thier weapons and armor gain recognition themselves, not having to deliberately open hell or fight wildlife only pretty much.)
But I'm rambling. If there's not going to be any bug fixes, then I'm gonna shoot for tomorrow night or maybe even tonight to start it.