Progress, problems and solutions!

As you can see, I am actually making progress! Soon the entire box will be complete, and I can start working on the more interesting parts.
In case you're wondering why the greenstuff is there, well... I needed something to fill the crevices where my cutting had been sub-par, and I though Liquid Greenstuff would do the trick. Well, it almost worked, it's just that I don't fancy buying the amount of greenstuff needed.
So instead, I just came up with another solution!
How, you ask? By cutting out "stripes" of the foamed pvc and glue them there! It'll hold well, support the structure and get rid of the crevices! It'll even act as alcoves upon which I can place the roof (one problem I had was how to get a detachable roof to sit tight - and now it just solved itself!).
So all in all, things are going at a good pace.