First of all, glad you unlurked! Don’t be a stranger.
As for that wood I’m not entirely sure but in general wood finishes are safe to laser — at least as far as damage to the laser goes. Like anything, the fumes are not safe to breathe… but good ventilation should take care of that.
I wrote up a kind of “what’s dangerous to laser” guideline. You may have seen it but it’s here, #4:
I’d say if you really want to be sure I’d look for the SDS on the finished wood, but personally I’d feel pretty comfortable lasering something like this.
And seriously, I’d love to see the sorts of thing you make! I’m sure you have things to teach us all. 