We are glad to hear that you are enjoying your Litter-Robot. To help reduce the amount of litter that your cat is digging out, we have two suggestions:
1.) You can try to use the Litter-Robot 'fence'. This is an optional accessory that snaps onto the lip of the entry to reduce the amount of litter that is kicked out.
2.) There are ramps available that are made out of corrugated material. The material serves as a litter catch. Both of these optional accessories are available at the Litter-Robot web site.
As far as your question about cabinets, you can go to http://www.litter-robot.com
and search the accessory page. There are several cabinets available, however they do not contain kicked litter. Please feel free to contact the Litter-Robot customer service team directly with any further questions you may have. They can be reached at firstname.lastname@example.org
The Litter-Robot Team