Underframe in a sentence as a noun

The utby underframe in the first one appears to have feet that are adjustable at least a few cm.

I hacked a similar Utby underframe based solution [1] together a few years ago which I'm still content with.

Their comparatively strong underframe simply sliced through the comparatively weak cabins like horizontal blades and caused huge fatalities.

Underframe definitions

noun

the internal supporting structure that gives an artifact its shape; "the building has a steel skeleton"

See also: skeleton frame