the planet-upgrade mod, the water-planet mod,
Ha, won't be my mods per chance?

There is no easy way of doing it currently, which is a shame. I'm sure in the future the devs may release something to aid us here, or possibly a public programmer.
If those are my first 2 mods you speak of, then you are in luck, I have merged these already for my future project (More planets and Bonuses in the same mod). I will upload it now for you, rapidshare usually takes about 20 minutes for a file this size, so I'll post back when its done. When doing mods I leave all the new text at the bottom of the file I am working on, so it can be easily separated from the original text. That is assuming that you were talking about my mods, because if you weren't, I look like a fool now

Edit:
Rapidshare LinkThere's no readme, but I think you know what to do, just the same as the other mods, copy in the entire Textures folder first, then add the modded files to it. It should work ok, if not, just give me a shout.