Here's a couplr of more builds:
paladin of tyranny5/hexblade4/divinecrusader1/boneknight10: 16 BAB, 9th level spells in one domain, almost full mount progression, some debuffing ability
paladin5/pioustemplar4/divinecrusader1/fistofraziel10: 19 BAB, 9th level spells in one domain, 8 smites a day as a 19th level paladin with some extras