-You could probably get away with your current setup, however, you will need to rename "lhang_tag_bone" to "lhan
d_tag_bone"
-It's possible the mc5 bone prevents compiling if it's missing.
-The bones that were removed from the old JO skeleton are fingers and "feet" joints, honestly it shouldnt make a difference, no one cares if the toes and remaining fingers are bending or not

.
Give it a shot and see what happens, carcass will give you error messages to help troubleshoot.