Nice work, Michigan! I have a similar sized 'bator and it has ~8 holes on the back side. Some toward the bottom for cool air to flow in, some near the top for heat to flow out.
I would want at least one upper hole to encourage ventilation, right now yours traps the hot air at the top (unless you have a fan blowing it back down somehow, the hot air will stay up there).
I have a turner now, but this shows the inside.
I would want at least one upper hole to encourage ventilation, right now yours traps the hot air at the top (unless you have a fan blowing it back down somehow, the hot air will stay up there).
I have a turner now, but this shows the inside.