Hi Nick, welcome to the forum! What size brood boxes are you using? Eight frame or 10 frame? For an 8-frame box, you should only be able to get 7 frames and a frame feeder into the box. If it is a 10-frame box, it would be 9 frames and a feeder. I am just having trouble imagining your set up.
The frames are waxed? Or do you have waxed plastic foundation in them? Or wax foundation? I am trying to work out why the bees are ignoring them.
Most people cover that hole in the inner cover (that is what that board below the roof is called in the US). You can cover it with a thin piece of wood, a tile, or tape/staple insect screen over it. If you don’t, they often build in the roof.
That suggests that they are feeling a bit short of space. They are probably having trouble accepting your outer frames. I would suggest you put those new frames one position further in from the wall. Usually your nucleus will have 2 outer frames of food stores and 2 inner stores of brood. Keep the brood frames all together, but put the food frames at the outer edges. Then put your new frames up against the outside of the frames of brood.
I would also suggest that you stop feeding them and replace the feeder with a real frame. Don’t add another box until they are properly using all of the empty frames you have added, otherwise you may get overrun with robbers and pests.
Across the top of the box where you type your message, there is a row of icons. The seventh one from the left is a bar with an arrow coming out of the top of it. If you click on that, you can select the photo you want to upload. Wait for the “uploading” text to disappear, and your image will then appear in your message.