Thank you! The card is 1mm. It is tricky to cut, but if done slowly and with a few passes it does go. I have got impatient a few times and tired cutting it in one pass, but I usually end up going off course.
I don't use scaple blades or modelling knives , I use one of my Stanley knives. I find I get a better grip and it goes through the thicker card easier.
I used liquid poly cement for most of it, but if needed I'll use a blob of super glue (and sometimes a support made from scraps like in the last photo) just to quicky hold bits in place while the poly cement goes off. Hope that helps