SplinterGroup
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LBD, you work like I do, anything that gets me the spacing or flatness I need is fair game to put under the laser.
I see no burn marks on your measuring devices...

I make allowances for sanding.


 SplinterGroup
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I have done similar, manually... though I have to break the line up into 3 pieces per join... The 3rd piece I turn into an engrave (with multi passes), to keep the separation join minimal.



 SplinterGroup
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It's a neat tool! Nothing yet that I couldn't do with other methods, but for burning in lettering or cutting random shapes is a lot easier to do quickly and accurately without dedicating hours of training to do it like the Masters do.

Also ideal for following templates... 3mm MDF is enough to work with (though 6mm is ideal)...
Getting curves (for "normal" templates) is a PITA...
When I need a large template, I cut it in multiple pieces, with dovetails on the joins for accurate fit/alignment.

If your first cut is too short... Take the second cut from the longer end... LBD