I wanted Y axis to be wobble free, and I had two v slot extrusions laying around, so I decided to use them as linear rails.
UPDATE 07.05.19: I bought real V-Slot and designed an end plate for extrusion for fun.
This is cheaper option than buying linear rails for MGN12 BLV mod.
I drilled as you can see, 7mm holes for eccentric nuts at the other side, and 5 mm holes to other side, on A8 base plate. Attached the wheels, similar to CR-10 or Tevo on them and voila linear carriage is ready.