That is gorgeous, what is the process?
I’d tell you but then…You know… 
Ask lots of questions here and LMA
Pick the most complicated vectors imaginable.
Dial in layout.
Typical Cerakote 2 color (with out the stencils), prep, spray gold, flash cure, spray black, full cure.
Do a test block same time.
Practice on test block.
Stress out for a day or so.
Use parameters from test block to burn slide.
Have a cold one.
Show off photos!
Test block:
3 color experiments:
That’s great especially 'Stress out for a day or so.", I read you there.
My wife is tolerant of me destroying a mug or two, I don’t know how she’d react to a ‘few’ slides … 
My buddy has is service glock engraved with his retirement date.
Looks great, thanks for the outline of the process.
Take care and post others…
1911 slide castings are 15-20 bucks on Sarco, need to block or smooth a little bit but good for practice. Can’t find Glock practice slides.
What make of laser? Diode or Co2
60 W JPT M7 from XT Laser
Using a very low setting though so about anything that can scan at 0.01 spacing would work.