I did'nt understand: prince captures as grasshopper (cannon-like hopper) or as locust (checkers-like overtaker)? And, boat, after it's diagonal step should continue moving as rook outwards or in any of 4 directions? It's weaker than gryphon, but stronger than Tamerlane chess giraffe.
But i like these pieces.
Optional rule reminds me draw rules from makruk.