Someone else may well have more info - but I'm wondering if it might be a Palram, they have been sold by quite a few different companies, I think (and to me, at least, look a lot like the Erromy model).
There are pictures of a 6x10 Palram here:
https://mygardenandpatio.com/p...
Here's a link to the instruction manual for a 6x10 Palram:
https://manualzz.com/doc/53229......
Best of luck with your project - I'm looking forward to hearing how it works out for you!
