Just the powercraft mod, I find it easier to use it when doing testing and I like the chimneys that come with it, however everything here could be made without any mods at all in survival mode. I try to keep all my stuff as close to plain-jane as possible.
:3 Ah, I see~. Okays, nifty then. Yeah, I actually have this castle that I am/was building on Survival mode. It's really really big. I only built one of the pillars so far, and it took me quite a long time. The pillar goes just a little above the clouds, I believe, and there's a staircase on the inside that swirls up to the top... I think if I do this well enough, though, no one's going to believe me when I tell them I did it all on Survival with no mods. |D