Sorry if this is threadomancy, but I just wanna say thanks for this mod. Above the dozens of others I'm using, this one has made KSP challenging again.
I am the sort of player that likes building stuff and seeing if it works, never been that fussed about the actual flying (I'm the Mechjeb type), and I've never fancied RSS, RO or the like. Your mod hits the balance perfectly; there's no rescaling of part capabilities, stock parts are all that's needed. But I have to work for it. This mod makes careful ship design genuinely rewarding, rather than just slapping on more boosters.
For example it has always bothered me that I can just throw together a 1-man rocket and be off to the Mun with no trouble at all, and the whole lander comes home easily. With this mod I spent hours designing an Apollo-analogue mission to get there and back on the tech available. And I wasn't doing it just because I could, but because it was the only way I could see of pulling it off.
I can't wait to try for Duna, where I expect I'll be forced down the ISRU route, rather than hopping biomes as I please.
So yeah, thanks again.