They are the grill panels on the first picture, and to cut to fit...thought I got that idea from the many different builds all linked on the main bator build post...if not a YouTube idea.... they are about 2 bucks each(found them at Home Depot, in the ducting area come in different sizes)...used aluminum foil to cover and protect for the sharp edges made by cutting...
Got the alarm to stop when it would turn on, had to adjust the High and Low Alarm settings (genius right? Lol)... it's held temp great, I need to put those seal strips like something you might use for a door or window around the top though, as it has to turn on often... put a thick throw blanket, folded up, on top of it, and now it holds solid... gotta test humidity next, got another day or so before some expensive eggs show up that spurred this to finally getting done...
Notice the bottle opener and cap catcher on the front? Lol... I'm going to add a shut off switch for the controller (for when I'm cleaning it. It still want to use the LED's and not risk popping the bulbs if they get wet while hot) and whenI do, I'll add a USB port on this bad boy...then my phone can sit in the cap catcher while it charged