I did see a post where the user has reinforced one end of the X-Carve with 20x40 extrusion and has the front ~300mm with no spoil board or table surface below it, I’ll try to find the thread and post it here.
Currently working on a version of @DavidWestley’s spoil board. Still to run a surfacing pass over it to get it level.
A downunder build
EDIT: The thread I was referring to is the X-Carve Workplace Showcase one. look for a post by @JohnPattillo
X-Carve Workspace Showcase