I can only guess “one can use Winimage to just create a single bootdisk” means Winimage can somehow be utilized to turn those three floppy disk images into a single CD.
After a quick skimming of winimaus.hlp, I’m guessing you can extract all the files from the 4 floppy images. Then, you can recombine all the files into a single CD image. (I’d guess any same-named files among the 4 floppy images are only needed once on the CD image.)
Have tried both extracting the files and “Create CDRom Iso image.” Also, read disk (which it suggests the file is being used by another process—which it doesn’t seem to be), write disk (with both use drive c and removable d; c again suggests the file is being used while d doesn’t do squat), format disk (not supported by the disk drive), extrace (ignore subdirectories and also extract all files into same directory tried), format and write disk (combo of the two), and it still doesn’t burn the disk or make a single file/program to be burned.