If it will be a glass lam, I got no idea on stack but twere me, I'd get with Kenny and have him grind some 2 inch glass down as thin as possible. Cut the glass lengthwise into 1" strips (that's the Jess Stuart method). Do the same with a wood lam for core. One wood lam should work.
I used that method making bows for two granddaughters and it worked out very well. They are older so things were scaled up a bit. They are already on the verge of outgrowing them.
But, (gotta be a but) when my grand kids were at the age of your kids I built their first bows with oak slats as sold in the big box stores. Use the on3s that are 1.5" wide and make a pure pyramid with narrow tips. Almost no tillering involved. Sometimes a little sanding on the belly. Pick slats with clean grain either edge or flat and back them with paper bag or any similar paper. Mostly they don't need backings but it's for your peace of mind.
I might have one around for a picture.