Here is a new update.
I mounted the mirrors at the back at the laser, on the moving arm and made a new laserhead holder.
Then I did some aligning. Remove the mirrors and place the back plate back in the holder. Cover the mirror hole with a piece of tape. Shortly fire the laser and look if it aim straight.
Then I did some test runs with 8 MM plexiglas
WARNING! Cutting plexiglass will produce chlorine gas when combined with the natural moisture in the air creates a form of hydrochloric acid. Be WARNED!
I have mounted ventilation to the outside!
Test run 4
Tried a name
More test runs:
Test run 15
Nice and clear!
Also tried engraving, it is not great but a start.
Also on wood, still not great but had to give it a try 
Soon more!