I wouldn't advise you to do it by hand, I did it for one of WERTS custom MT's and found it straight forward enough, but I wouldn't try it for an FBM.

For a head morph you only need to create 2 files, 1 for the Channels and 1 for the Groups, but if your doing an FBM or want a Root dial then you need to add 1 more for the ERC, then multiply that by the number of body parts. For a Custom FBM your looking at creating around 190 files, then you have to edit your Delta & ChanVis files so they will load into the new channels.