I suggest checking out this plugin: http://forum.kerbalspaceprogram.com/threads/80220-Celestial-Body-Science-Multiplier-Editor It's much easier solution. Then you can install Custom Biomes (and maybe even Kerbin Science Initiative) and still make the tech tree harder to max out by just doing flights in Kerbin system.
Damn, those models are so awesome. This mod had potential to became nr 1 rocket mod. Well, I'm hoping that in the future it will be released (even alpha version of alpha version). Till then, good luck!