I think the back leg and foot needs more work to make it look like he's leaping, and I fear it would take some hacksawing. Still, if you're game, I think it would be very effective!
As it is though, he needs grounding or lifting, it's in an awkward half-stage currently. He's a biiiig dude, which makes him even scarier if he's able to move around quickly like that! Perhaps some sort of grav-chute or jump pack would be appropriate?
I love the combination of parts though - I've been looking for a suitable combination to go with my own ogryn carapace armour I've got kicking around. I might have a spare pair of Tyrus' legs to go with it...