I also found my eCS 1.1 disks(OS/2) and was able to get it installed once I told it to use IBM's IDE driver instead of the DANI driver.
Found a glitch with the mouse pointer emulation. Galactic Civilizations changes the mouse to colored pointers and they get scrambled. If I drop down to 256 colors they look OK, but it's not worth doing that. I can recreate the scrambled mouse pointer problem by changing the system pointer to one of the colored sets.