The BES License and Inventory site contains an analysis “Hardware Information (Linux)” that might have some good hardware properties for you…
For the dmi properties, here are some you might try based on my quick research (although I don’t have a Linux system readily available and I have no idea if these will give you want you want):
manufacturer of base_board_information of dmi
product of base_board_information of dmi
manufacturer of system_enclosure_or_chassis of dmi
oem_defined of system_enclosure_or_chassis of dmi
manufacturer of system_information of dmi
product_name of system_information of dmi
Hope one of those help… (let us know if one of them does work because I am sure someone else is interested…)