So,I got it on a GitLab repo. You’ll notice it’s just Materia-kv, slightly modded. https://gitlab.com/Gsbhasin84/pocillo-qt
The svg’s are in their respective directories
The svg files need colouring as per the UB colour palette https://github.com/UbuntuBudgie/assets/tree/master/Color%20Palette
If you need help, sorry I can’t help much, but if you open an issue at https://github.com/tsujan/Kvantum/issues the author is happy to help! The Manjaro distro did this for their own Qt theming: https://github.com/tsujan/Kvantum/issues/282
Please file a PR on GitLab and ping me here in this forum, so that I know to check it out and accept it (if it works 
)