Multipurposing Scaffolding...

As a loft bed to make room for a sofa and desk underneath.
I have found a couple Toronto-based resellers of the required materials, here(Russ Dilworth) and here (Don Fry), but I imagine that their stock may not be as wide as all of what's online. I have yet to verify this suspicion at the time of writing.

Online pricing suggests that $200 for a couple used frames and ledgers to go inbetween is reasonable and somewhat conservative from my perspective.

The advantage to buying a kit online is the powder coating option available.
The compromise would be to paint (with equipment and professional supervision) the used tubes and frames to make them appealing in a domestic environment.

The goal I'm considering now is to use a pair of frames that are 5 feet wide (exact for a queen mattress), and cross bracing diagonally.

I think that ScaffoldMart.com has something very close to what I want.
This image really reflects my intention, and of course, online material has that powdercoated edge.