They will be able to get out of that if you do not have some kind of lid to put over the top. Even just a window screen with something heavy enough to keep it on will do. Chicks can jump surprisingly high at just a few days old.
Also... the heat lamp is close to combustible materials.
I love the beautiful artwork on the boxes; very talented and clever! I"ll bet the future coop you make for them will be amazing. As far as functionality, @Sally PB is right on both counts. Don't hesitate to seek more advice; we are here to help.
Thank you so much for the advice! I do have a cover for it I just didn’t show that because it’s not cute lol any suggestions on the heat lamp? Maybe move it to the other side? This is only temp as I will have to make a bigger one as the chicks get bigger! Thanks for the help!