I couldn't suggest a better incubator. When I worked for a large commercial breeder in the mid 90's, he had a large incubator that cost him around $4k to build. It had double french doors and was almost air tight. The egg capacity was about 500-600 large python eggs.....maybe even more. The average hatch from the unit was around 40-50%. I told him to sell it and buy a hovabator for every clutch. We modified them to fit large shipping boxes which measured a little longer than the typical square boxes. That season we produced about 20 clutches of Burms, Sri Lankas, Indians, Bloods, etc......with a 100% hatch rate. If you have a Rural King or TSC(tractor supply company) in your area, you can get them for about $30. With the modified version, you should be able to fit about 6 clutches of ball eggs in there. I just put the vermiculte or perlite directly in the bottom and incubated the eggs WITHOUT an egg box. The last clutches I incubated with this method were burms. I put 2 clutches in one box with a total of 56 eggs and got 100% hatch. Sorry for rambling. Good luck.
Brandon Osborne