Help for making new classes for other races

[Ansalagon 10]

Okay, My grop recently started to play a 40k Campaign... We have been using a homebrew ruleset, but GM was unhappy with it, so we considered switching to Dark Heresy+ascension
 and Deathwatch..

 

At first it was only two people (and the GM) they played a space marine from a custom chapter that is closely tied to Mechanicus and a high-ranking (and somewhat insane) techpriest. They are sent a sparcely populated backwater planet (the imperial war effort is trying to stop Abbadon's 14th crusade, so they are short on manpower)

On this planet where everything is wrong (orks are in an uproar, deamons lurk and a chaos marine sorcerer is leading gathering his warband in order to obtain an Eldar Infinity Engine) they accidently destory the wards on an eldar base, so it is no longer protected against the deamons... So they end up having to team up with the remaining eldar (this is where a new player joins, she plays the young eldar farseer and the player who played a spacemarine makes a new character, a psyker mechanicus techpriest)... And this is where the last player joins.. Playing a playing a rogue Necron lord (His C'tan ruler was destoryed and he awoke freewilled from the long sleep, and is currenty trying to build forces by bending tombworlds to his will so he will have enough stength to destory the remaining c'tan. His current motivation is that if this plannet falls the imperium will order an exterminatus, and the dormant tombworld he is trying to awaken on a nearby planet might be discovered) Yes this an odd character, but it all work surprisingly well together...

 

So we would like to hear any ideas to the classes?
the techpriest psyker - who happens to be lame and is sitting on a walking throne.. Will probably be made using DH/asc

The Eldar farseer - not sure what system to use...

The Necron lord - most likely be made wiith Deathwatch with the necron trait and some gear from the other reach book

That is about it, any help would be much apprisiated

 

[Amaimon 132]

EXTRA HERESY!!