Glad they are doing well even though Mum keep trying to relocate them!
I know what you mean about you wanting to see them, obviously to check on them, Mum and Mum's food and water levels etcetera. I am so pleased that we have a small cctv camera wired up so I can spy on them without them knowing. Again useful for a pregnant Mum to see if she is getting nearer her delivery time. We already had some wires in place, so luckily it was not too tricky to do. I think the camera cost around £19 from Maplin - on offer at the time. But last year something chewed the wires, and we had to replace it with a slightly dearer one.
Another thing I do, with there being other cats in the room, I use a Feliway diffuser and keep Mum and kittens covered over with a lightweight sheet, and cardboard around the cage for good measure! All in an attempt to make Mum feel extra safe and secure. Then I literally just do the minimum amount of contact to let her get to know her babies.
Keep up the good work!