I saw there was a new release of XEiJ x68000 emulator that has a rom creation tool for making new 1.6 IPL roms for real hardware so i thought i would give it a shot, the new IPL roms have a few nice features such as automatically detecting and setting switch.x sram settings at boot and sram clear function for machines without it. for the cz600c I used two 27c512 eproms and the XVI uses 27c1001. you can read more about it here: https://stdkmd.net/xeij/iplrom16.htm
Do you need to do byte swapping on the image or does the java application do it for you automatically?
I think it exports the images directly - eg for the Expert it dumps out odd and even ROM binaries.