You will run into a lot of issues if you have a flat plate or material on the edge of 2 x 3mm pex sheets with an insert- you need to have a channel to "edge" it
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Like that.
I would rather just try find a tray handle in silver that has 2 holes in it that you can use for clamping the 2 sheets
Google "tray handle" for some images
Also have a look at places that sell cupboard and draw handles - for ideas , google "silver cupboard handles" and go to images
Rodney Gold, Toker Bros trophies, Cape Town , South Africa :
Roland 2300 rotary . 3 x ISEL's ..1m x 500mm CnC .
Tekcel 1200x2400 router , 900 x 600 60w Shenui laser , 1200 x 800 80w Reci tube Shenhui Laser
6 x longtai lasers 400x600 60w , 1 x longtai 20w fiber
2x Gravo manual engravers , Roland 540 large format printer/cutter. CLTT setup
1600mm hot and cold laminator , 3x Dopag resin dispensers , sandblasting setup, acid etcher