AR help - object won't place

Hi! I'm currently working on an AR application, I've put the code in a github so you can see it. It can recognise the ref image, but for some reason it won't place the object correctly. The object I could't place in github, as it was too large of a file. The github: https://github.com/Sjandor/postar And some info on the model is as the image. I've made it quite tiny, as at first it was too large. I've also had some code to make the size of it relative to the image reference, but to no success. Can anyone help me out on this? Thanks in advance!

GitHub

GitHub - Sjandor/postar: AR application

AR application. Contribute to Sjandor/postar development by creating an account on GitHub.