Yeah it's a decent build, although the choice of gear seems a bit weird to me.
I believe the player's armour and horse's armour should be somewhat balanced, otherwise you don't use the advantages of the better armour. Example - what's the point in riding plated charger naked? You can't use the tankyness of your horse if you yourself die in 1 arrow.
Similarly, what's the point in wearing heavy armour (well, medium-heavy) if your desert horse has none? It relies on manueverability to avoid being hit, so you being armoured is a doubtful advantage.
Italian sword isn't the best for fighting on horseback. Other swords, like Long Arming Sword, KAS, NCS, ACS, are all better because they have more length and damage, while having less speed. But weapon's speed doesn't really matter when you're on horse.
Italian sword is, however, what I would use when teamfighting on the ground, instead of long axe.
But all those notes are a matter of preference, if you feel you want to use what you listed, go for it, it's absolutely not a bad choice.
