Do you have any experience with or opinions of Sailrite machines?
I ran an old Singer 127 through a pile of fabric a Sailrite was struggling with. The old domestic Singers aren't industrial, but if you can't do it once, slowly on a 15, it's even odds whether it can be done at all[0].
The 15 (or 66) is a much, much more refined machine. Parts (bobbins, notably) are readily available, and if you find you do need more, you can sell it for what you paid for it. The Sailrite, IME is a clunky, value engineered version of what you really need when you hit a problem an old Singer can't solve. Once you get to that point, you'll know what you need and how a machine should run.
If you've already hit this point, I'd suggest looking for an old industrial machine on your local Craigslist or Facebook marketplace equivalent. The Sailrite is likely to piss you off with how crudely it runs and handles. I'm told by my upholsterer colleague that an import servo motor is a huge upgrade from a clutch motor. Especially if you're coming from a domestic machine with a variable speed control. On the rare occasion that I've used a machine with a clutch motor, it's a grab hold and hang on for the ride kind of experience.
[0] I'm explicitly not including things that require a serger, blind-hemmer, cylinder bed or other specialized garment/leather machines. The Sailrite won't do those either.
I later picked up a Sailrite LSZ to do some zigzag work on sails. Compared to the Consew, the sailrite feels really clunky, even with the Sailrite servo motor upgrade. It's relatively rough and noisy compared to the Consew, and has less power. Main upsides are the size, and the zigzag stitch for sail work where you need some stretch.
I've ultimately kept the Sailrite because it's still pretty solid, and can be stored on the boat where I need it the most. If I was doing upholstery or canvas work in a permanent shop, I would've kept the Consew, hands down, it was a much more capable and pleasant machine.
The walking foot feature is very useful for heavy materials. I tried sewing light-weight materials on both of these machines and it was awful (bunching, tearing on the foot, can't use really fine needles, etc).
I know I was pretty down on the Sailrite, but if you're doing diy sail sewing, it's probably a pretty good compromise for the job.
Background for non-sewers: all fabric stretches, but for most things on a human scale, you can ignore it when you're sewing. When you get into sail-sized products, you'll end up with puckering if your seams can't stretch with the fabric. A zigzag seam will stretch with the fabric. A straight stitched seam will not.
Further background: AIUI industrial machines are a lot more job and/or fabric-specific than domestic machines. And you also get into needles and bobbins that you can't pick up at Joann.
Your sibling commenter is likely more knowledgeable than I am. I was helping a friend doing some cushions for her boat. The Sailrite was struggling with the Sunbrella-type canvas. For sailcloth (on that size boat?) it probably would've been fine.
Good luck!