For primarily Orcs/Necrons, this seems pretty good to me.
Personally, I'd run Plasma/Missile instead of Plasma/Fusion. The extra range of the Missile Pod is really nice to have, and it can also help take down lightly armored vehicles. But Fusion Blasters are quite nice against 3+ or 2+ saves if you can completely wipe the unit.
It seems a little odd to me to run Shield Drones on Firewarriors instead of Broadsides. Besides, you should be able to the Firewarriors in some form of area terrain, so why not give them Gun Drones instead? Functionally they will do the same thing, but also give you a couple extra short-range shots -- and they cost less!
I would try to use all three of your Elite slots, even if you aren't maxing the units. 3 2x units is more durable, flexible, and maneuverable than 2 3x units. And if you are running 2-model units, you don't need to pay for Bonding Knives.
I wouldn't take the 'ui or BK on the Pathfinders. If they are forced to retreat with 3 or fewer dudes, you might as well let them run. They won't be doing much for you the rest of the game. I'd also consider dropping the Pathfinders to 6-man units. 2x 8-man units is a lot of ML hits.
You may have some issues with objective games, considering your lack of mobility. You don't have much to contest with, and you don't have mobile troops that can claim objectives outside your deployment zone. Moving your troops (on foot or in a PF DF) means sacrificing firepower. It might be beneficial to add a 6-man FW team in a DF that you can use to claim objectives mid/late game. Or a small Kroot unit that can outflank.
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