It's a start, but I think you will need a lot more work put into it before you get a great deal of interest.
The world or story for the game needs work to make it interesting on its own.
It may be by intent to work with
40k, but it competes with other games that are well suited to that already.
Inquisitor
Necromunda
And
40k itself
I think it would be much better for you to get your own world built up and it's own story's.
Your design goals are good but little to work on but you only really have he basics for the rules you are thinking about.
This means there isn't much to go on positive or negative here.
Concept starts out wanting to make a game that's highly customisable but then seems to dive head first into the concept of guys in power armour.
This makes me think you need to work out a lot more on basic concepts and how the world and fits around it all.
Your five classes also seem to be very mixed, power armour is a big thing but you have rogues, psions and noble as a class.
(Personally I would just use perks to define the lords, they are all lords already can that not be there class ? )
In the end I think this is a great start for you to sit down with some friends, work out some rules and cool story's and get playing. But there isn't a huge amount to go on yet for a more open thoughts I think.
hope this is helpful a bit to you.