I like where you are going with it, but I would like to suggest a few things. I feel that despite the having Stalker support, you're really going to struggle putting out enough shots to sufficiently harm anything. I would recommend dropping the wraiths honestly, and that'll free up 230 points for you to put into your troops. I personally like full squads of 10 Immortals with Tesla since they're good at being fire support. Especially with the twin-linking provided by the Stalker. However, that said, if I do decide to put my Immortals in a more aggressive stance then usually what I'll do is load them up on Gauss and put them with a cryptek with a veil of darkness or in a night scythe and teleport them into the backline or behind something squishy for
str 5 rapid fire goodness. This kind of thing will typically murder things like Tau firewarriors because of the AP4. As a side note, don't forget Teslas are assault weapons so it is possible to attempt to assault after you fire them if you need to finish of something like a 3-4
tac squad/firewarriors (be wary of supporting fire) imperial guard vets/small squads, and things like that. We aren't good in close combat, so don't charge into terminators for example, but we can hold our own versus weaker troops.
There is some controversy on the costliness of the Stalker, but honestly I'm of the opinion it'll work unless you're going against super competitive lists/tournaments. For friendly, casual, or even semi-competitive settings. So as long as you're striving for that you should be good. I'd recommend also going twin-linked gauss cannons on those stalkers as it will allow them to give you a little more long range support, but it also wouldn't hurt to play test them a little and see how you like them. A 2 shot multi-melta/heavy flamer are nice for an army unusually devoid of templates.
I'd also throw on some
MSS for that Overlord. It'll still work even when he is on the barge, and it'll help keep him alive a little longer against tough things.
I'd recommend dropping the solar pulse too. Generally, it's quite often we will get night fighting turn one, or be out of range to do anything significant if we decide to light up the night.
YMMV though.
Definitely buff up that Ghost Ark to at least have 9 warriors, and then I'd recommend a Cryptek, such as a Cryptek with a lance to fill in the last slot. Or if you'd rather, just a full 10 warriors.
It's also not necessary for you fill in the
FA slot, unless you want to of course. If you do have the urge to fill in the fast attack slot I would recommend then scarabs for a cheap distraction unit/counter assault unit/armor 14 muncher. They're effective for what they do and cost, just keep them away from Flamers and other templates (if you're playing an Adeptus Sororitas army, good luck!
)
Tomb blades have some potential, but I'll be honest I haven't used them before so I can't say anything more than they look good on paper with twin-linked particle beamer though.
Lastly, I'd recommend at least one more barge to help with fire support. They're my favorite Necron unit because of the amount of damage they've done to anything with a 3+ armor save or higher, and the number of
AV 10, 11, 12 vehicles they've slaughtered. My friends have a tendency to kill those first because of the damage they've seen them do.
Hope some of this helps.
