I came across this tangle a goodly while ago. I tried to draw it, but without much success, like Fengle.
However, watching a video by Zen Linea, as well as having cracked Fengle meant I think I’ve successfully drawing Trelina, with some variations as well.
I realised, soon enough, that I wanted to keep the basic structure of Trelina, but focus on ‘channels’ that could be used to house other patterns. Indeed, the very first Trelina I drew was the one in the top left and I wanted a wider ‘channel’ to put a pattern in.
The bottom right version has a big nod towards Fengle. After all, if I’d not worked out how to draw Fengle, I doubt I would have managed to draw Trelina.