Just look at the airflow path, most of it just bypasses the block eruptors. He needs to mount them on some sort of tower, in the throat of the fan air intake. I'd have used meccano in my time, but that's a bit uncool these days (great stuff though, used to have it in our labs at uni). Perhaps that kinetix stuff, or even lego (comes with cool figurines too, can set up a nice montage to display the BE's in their mining glory).