Yep sweater box rack will last You up tp 1600-1800 gram
I have my 1250g male and 1075g female in it and they have plenty of space... with large hides... with dividers You gonna be set for long time and for different sizes of balls

I use divider in separate tube now to house my house snake and it works perfect !!!

As thermostat.. I use Heprstat but Rich have his own line of thermostats now and people are quite please with them.. shoot him an email and for sure he will give You right advice..