I've got an LCII I need to recap before I part with it and actually you could run the LCII with two floppy drives because the pads are there. It just needs a header... and an LC 1 case with the two slots of course.
Same with the logic board too. Why build a whole brand new logic board when you can just switch the CPU. Okay, I know some stuff had to change to support the 68030, but, it's a very similiar design
I run mine with a floppy drive on the right side, and a Magneto Optical drive on the left side. I've then mounted a small 2.5" SCSI-to-CF inside elsewhere.