Preparing a high poly for Quixel NDO - DDO?

NAIMA

Hi , I was thinking to finally try NDO DDO that I got time ago and never had chance yet to use it , so working on the high poly model for a spaceship here : http://polycount.com/discussion/169587/spaceship-hardsurface-subdivision-polymodeling-learning-and-help#latest

I checked the tutorials and sems I am forced to UVMAP the whole model , since there is no way in time that I can uvmap all I decided to uvmap only the main clean parts and reserve procedural texturing eventually for the pipes and other stuff I have no patience to uvmap as too complex.

Since I am experimenting and checked that opensubd is not preserving my uvmaps, I was thinking to go fast to use the new feature of the 3dsmax uvmapping that in one click autouvmaps the whole object according to angles , so if I have a box shaped item it will split the box into 6 maps , now , is this procedure ok to use later in Quixel? Or I need to attach every seam ?
Should I have to weld every seam then I guess is not a good system to go , is there another way ?

I usually have a stack like

edit poly
turbosmooth
shell
edit poly ( delete inner faces )
turbosmooth or opensubd to smoothen the edges of panels
uvmap
symmetry

NAIMA

Also , how I am supposed to actually arrange maps for having a good decent scale for the textures? I have at thhe moment split into wing top  ,wing side top , engine top , fuselage side top , and I have divided them by material that I will use later .

But for other more complex parts I get instead a lot of wasted space .

NAIMA

Any sugestions?