I bought my Bernina 1050 Sport new in 1995. It is a workhorse, with perfect stitching. You might find that your feet for it fetch more than the other machine is worth. I only use the zigzag, the blind stitch (hemming) and very occasionally the zipper foot, and the buttonhole foot.
Adding later - It has never needed new parts, despite a lot of use.

@mudcat, if you lived closer, you could try out my sashiko machine. I hardly ever use it- the threading is completely different from a regular sewing machine, and I always have to watch threading online first. You are right - it only does one thing. An option would be a group buy to share, as it is very expensive. Or contract to sashiko quilt other folks' work. Or make handicrafts to sell.

 Mine was an impulse buy.

I have the Babylock Sashiko - the downside is that it only does the sashiko stitch on the top - the bottom is a continuous stitch. And you can't see when the thread is going to run out - it is only in the bobbin.

snuggly and beautiful!

 Could you have taken out too much for the adjustments and it is simply riding down at the back?
Can you overlay your TNT pattern and see the differences?

I vaguely recall a guide to sewing raincoats that said that you need to waterproof the sewn seams with tape and glue - could you put the canopy together just with strong glue and tape?

As the tartan seems undamaged, you could leave it in place as an underlayer.

Eye candy