Found strip at Lowe's. Now what?
Form the strip so it sits on the stir popper, then cut it to length. I'd begin with an overlapping joint; no chaff chute (chaff can be easily vacuumed up after the roast). You can always get as creative as you like after you've been roasting a while.
The video shows how I place the thermocouple so I can monitor the bean mass temps.
Which corn popper did you buy? There are modifications that need to be done for each of them.