I've made numerous revisions to the case and had to roll back the lid to an earlier design as surprisingly, it was a better fit. Now the pcb and lid are both a friction fit into the case, with screws through the posts and pcb corners being optional if you feel the need/desire to do so. I still need to sort out the buttons and the led lights and am toying with a couple of ideas for each, but the basics of the case are effectively ready
n.b. to those printing, it WILL print and be useable if you print without supports, but it will be a lot more sturdy if you include removable supports.
Here are some pictures of the case, the changes from this to the current one are mostly cosmetic.
i.imgur.com/Lsc5GY7.jpg
i.imgur.com/298zkXV.jpg
i.imgur.com/z6F6rLU.jpg This shows the old lid with the new case, it works a LOT better than the newer revision lid ever did.
Here's the entire album including some of my failed early attempts for your amusement..