Besides the three Gilman uses to base his system on, also worth a look as to piece-type topography are /play/erf/Hazlewoo.html and /play/erf/Galaches.html.
Those two differentiate more strikingly from Wellisch, Hazlewood for its pawns and Galachess for its Knight.
Also HexTony, /play/erf/HexTony.html and
Monarch, /play/erf/MonarchH.html for the same pawns and knights. Gradually the object is to see the innovation in the AltOrthHex chesses after organizing the field mostly around Gilman's Wellisch and Glinski/McCooey.