1. You can launch GRUB4DOS from a Syslinux menu. To do this, enter this into the syslinux thing:
APPEND --config-file="find --set-root /stuff; map /stuff (hd0); map --hook; root (hd0); chainloader ?????;"
This will require adding grub.exe (also included with the grub4dos package)
2. MEMDISK should be smart enough to detect whether you have a floppy disk or hard drive image and its geometry. That is, you can remove the c= h=, s=, and "floppy" parameters from the MEMDISK command line.
3. Can I download some version of UBCD before 5.2.0?