H2T Back w/ Heatset Insert

I wanted to make the already awesome H2T case by Muzi a little more robust by adding a heatset insert to marry the two halves together. Here is my rendition of that. You will want to use an M3x5 thin-wall heatset insert. These are the heatsets I'm using https://www.aliexpress.us/item/3256806307810764.html (408pcs M3).