Update 1
I've got the basic layout in place. The plan in the end is to have the resources and tabs hidden until they're unlocked to make it less cluttered when starting. That is currently planned under 'would be nice if I can get everything else working'.
The only tabs that currently have content are Core, where you can buy 'buildings', and Entrance, which I want to set up so you can manage a group of friendly goblins you meet at the beginning of the game. I don't know whether it would be better to put the extra information - like the effects of the goblin roles - to show up in something like a popup if you click on an info box? I'd also appreciate any suggestions on getting a log to work.
Other than that I've got a bunch of variables that don't do anything yet and a button I can press to make a number go up. So, progress.