I was thinking about how it will be when the MechLab comes out.
Remembering the MW3 days, I came to the convlusion, that being in the MechLab sometimes took more time than the whole mission ahead.
All this customisation with your mech, put this in, put that out, scratch it again and start all over... for me it was fun.
so my suggestion would be:
a
stanalone MechLab, working independently from a Mission/running Game.
That's the place, where you can build and SAVE your preferred Mech-Variants and use/load them later in any game mode (as long as you have the money needed) with just one click.
p.s.: i would also like to see the paintjobs on mechs again. If not full-body, then just stuff like the teeth on the bushwacker
