The only thing that determines width is the removable section cross brace in the rear that you lift with a jack. I suspect that could be adjustable width.
The whole thing looks like something you could weld up in a day. The front supports are just angle iron with a hinge point. Not terribly difficult. The most expensive piece will be the plate the ramps are made of.
As neat as it is, I don't see that it really saves you a lot of time over jack stands, though it seems far safer and puts the vehicle at a greater height. You can still use jack stands on the ramp to the chassis to allow you to remove a wheel if needed.
Overall, I do like the design. Depending on how well it can store when broken down, I might try making one myself.