Well, this is interesting. I don't think I've ever seen a list like this before (Hydra's, well, aren't mobile. This is mech).
I question the need for two psykers.
Are the veterans in a chimera because if not then this is some weird ass mech...
If yes, ok this list looks alright. 4 tanks in your face will mess with most people, but still not a huge amount of damage output. Wolves have to get in close, and you know what else is close? Meltas. Meltas are close. Vets can deal with tanks pretty well, but if they're stranded they'll just be sitting there. You're also kind of low on scoring units. Ratlings are good (very useful for points, those guys...) and hydras are good if you don't mind sitting back a bit. In general though, I just can't see this list being super competitive. It definitely has potential, though.
I would get those vets chimeras if they don't (based on points, doesn't look like it...) and consider taking more rather than those bale tanks. Flamers on vets is almost as good (though not against SM, and plasma is great against that and better against termis). Remember, the core of your mech guard should be lots of vets in chimeras (or if you want to keep it cheap, IS can work ok...)
If you go down to the woods today, be wary