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Re the electrics;
I was thinking you get an electrician do the connection from the main ring to the loft and install one double socket, from which you run a big standing lamp (so the grandparents can see) and an extension cable with all your office shit.
Then when you can you do all the bits you need for a real space as and when - sockets, lighting, etc. Once it's all done get an electrician back to sign it off.
Aren't those just normal arch topped windows turned upside down?
Kinda think based on what you said I'd just get the structure built, room walls up, and electrics in. Then make sure you've got provision for a bathroom in the future (but not put in a bathroom now).
When you were talking about DIY to save money before...
I wonder if you could do a lot of the electrics yourself (with proper research obvs)? My logic is this: