Storj kan already be used on cheverto, just pick S3 compability storage and then setup S3 API access from storj. That is all you need, after that your chevereto can upload to Storj storage bucket.
Also keep in mind that storj takes fee for both storage and bandwidth.
Not only storage fee 4$ /TB.
Bandwidth is 7$ /TB
So totalt cost would be 11$ /TB totalt for both.