Yes, i leaved screen and board inside. I don't have any problem of temperature, the printer doesn't make much heat ! I think that the led bars i installed produce more heat. I should have put less bars, i have 4 x 8W of led, and that's really too much lol, it's like sun inside ^^
And as i put a PC fan (120mm) on the bottom (just under the board) and one on the top of the table, running in the same way, the air flow is perfect. The thermostat power the fans only if needed moreover.