I like the idea, the list is for sure going to be a troll, and may even win a tourney. Could have problems with dark eldar and space puppies.
The necron list looks pretty good. I am no necron player, so I am not sure. Only played against stalkers, and they are a real pain in my

.
The tau list needs some work.
Drop the commander to a shas'
el with a target array. If you are abusing night fight, you need to abuse range as well. Give him a plasma rifle instead of a burst cannon. Run him solo and switch the target lock to a target array. Hardwire a multi tracker as well. I would drop the marker drones here.
Make the bodyguards into two solo suit squads.Team leader,
HW Blacksun filters, plasma+missile,
hw multi trackers and target arrays. Drop marker drones.
FW's should be in either minimum squads, or max. I would run 2 squads of 6 with team leaders with blacksuns and markerlights.
If you are going to abuse marker drones, you want to marker mule with a stealth team. I made a thread about this, and I will quote juraigamer's reply on the loadouts
"One is 6 suits with 10 gun drones and 2 markerdrones, plus markerlight and team leader + bonding. Another is 3 suits with 2 marker drones and markerlight. plus lead and bonding. The final is 3 suits with 4 marker drones 1 light and 2 gun drones, more suits and drones as points permit. "
I would run a unit of the second configuration, to keep it cheap. Maybe blacksun the leader.
The list needs broadsides, lots and lots of broadsides. Mark a target, and then railgun it from across the board as the sides sit in safety. Smart missiles also ignore night fighting, so multi trackers are an option.
Keep the stormlord near the gunline of sides and warriors in case the tau get assaulted. Tau die so hard in assault is is not even funny.
HQ Shas'
el: Plasma and missile, target array,
hw blacksun filter,
hw multi tracker-100
Elite
Stealth teamX3:2 marker drones, team lead w/bonding knife, markerlight, blacksun-163
Crisis teamX1. Plasma, missile, target array, team lead,
hw multi track and blacksun-80
Crisis teamX1. Plasma, missile, target array, team lead,
hw multi track and blacksun-80
Troop
FwX6. 'ui w/markerlight, blacksun-83
FwX6. 'ui w/markerlight, blacksun-83
Heavy
Broadside teamX2-A.S.S., team lead w/blacksun, multi tracker, target lock,
hw drone controller, 1 shield drone, bonding knife-198
Broadside teamX2- A.S.S., team lead w/blacksun, multi tracker, target lock,
hw drone controller, 2 shield drones, bonding knife-213
1k on the nose.
That gives him 4 railguns in 4 different directions. He should focus on presicion targets-small elite units,
MC's armor. Crowd control is more on you, as he can double tap the warriors in a pinch or use the stealth team burst. He should
JSJ in and out with the suits to keep as much distance as possible. Using their acute senses+blacksun means they will not be as dependent on markers going off, having a potential 3' vision range. Opponents are stuck to 2'.
If you can get any assault into your necrons that would be a godsend. I hear wraiths are good, and with night fighting they could advance up the board unharmed. You need a counter charge in case somebody deep strikes or outflanks against you.