It isn't just the frame you need to be concerned about but also the tracks. Not all machines have the same system.
The original HQ16's would fit on what were folding tables, being clamped down for security.
I got my HQ16 used and had a friend make the table for me. It is wood and steady enough to hold a cow! We put the tracks on that and then the machine on it's trolley. It is still going strong even though we lengthened the table last year. The cost of the homemade table was well under the cost of a HQ table.