Clean wet sanitized seeds put into a mesh laundry bag can go in your regular dryer on low. If you have or can borrow a Dremel the slots would be ez to do on your homemade SCB. Felinepine has a cat litter box that could work w/safflower seed litter. Safflower seeds will sprout if left damp, so keeping them dry will help to prolong the lifespan of the litter.In a pinch you can use black oil sunflower seeds instead of safflower seeds. Necessity is the mother of invention.