I'd be interested, and would be happy to add it to the guide in the wiki, if it is really user friendly I've been meaning to update both the Basilisk II and SheepShaver guides to make them easier to follow and with fewer steps. I'll certainly test out your proposed installer since I have more time on my hands now.
I won't get around to it for at least a few weeks, but it shouldn't be hard to do. I've done similar things for the vDos and DOSBox emulators.
What I have in mind now is an Inno Setup installer that would install SheepShaver.exe, SDL.dll, a keycodes file, a prefs file, the GTK runtime, and maybe an empty disk image for installing Mac OS. Then the installer would run a compiled AutoIt Script that add the GTK folder to the path, prompt the user for a ROM file, and prompt for the location of either a pre-existing Mac OS system disk image or an installer disk.
Questions: Where should the folder with SheepShaver, etc., be located by default? What settings make the most sense for RAM, screen size, etc.?