Modifying my popcorn roaster

I've bought this popcorn popper for about a year already. I used it to roast very small batches of beans, sufficient for an 8 cup french press.
Yesterday, i drilled many little holes to the cover. They say it helps to provide better ventilation for the hot air to exit and prevent the popper from overheating (popcorn seeds takes about 45-90 secs whereas green bean would take up to 6-7 mins). I also included a thermometer to record the temperature of the beans during a minute interval.
I will be trying this modified gadget on the next weekend perhaps.