Signals boxes are one of the few buildings on a model railway that really need some interior detail.
If those big windows show a blank space inside, it just doesn't look right. A common problem with resin ready-to-plonk buildings is that you look in and see white walls several scale feet thick. If there's one building that benefits from kit construction, it's the signal box.
Even the little Wills box needed some detail inside it. The kit includes 4 levers and a basic frame. That's excellent as these are the expensive or fiddly bits to make.
I thought the rest looked a bit blank though so added a couple of noticeboard rescued from another kit.
For my signalman's rest, a big, comfy armchair is nice. A model one made up of wooden offcuts was easy to build. Sanding the corners off the wood makes a reasonable representation of padding (this isn't Pendon, I'm not cranking up a sewing machine) especially once painted with a reddish brown and dry-brushed with Humbrol 70. The colours are closer in shade than the photo shows.
While the windows aren't huge, you can see the detail. Whether that will still be the case with the roof on is another matter. I'll ponder some lighting over the weekend.