You are going to prepare your template for LDPC.
* Take your main file.
* Color the subfiles.
* "Inline selection recursively"
* Remove all edges, conds and the back of the kitten 'til you've got only the outline looking from the front with no faces overlaying each other.
* Start LDPC and "File -> Import from DAT -> Project on XY Plane (-Z, Front)
!!! Read https://forums.ldraw.org/thread-27173.html !!!
The only restriction you have are the boundaries of the original triangles and the split. All vertices have to lay on that line.
w.
LEGO ergo sum