Even higher loft bed mattresses

Hello, I'm new!

I would like to know if it is possible to create loft bed mattresses that are higher up than these CC ones:

This is the height the bed naturally is set to when I put the object into the room in build mode. It's a platform bed and mattress. The walls are set to the shortest wall height.

And here the bed is at a height that looks nice, however the sim can't get into bed after I've raised it up using Cntrl 9 key.

Here the bed is from another camera angle. Isn't this just tiny house perfection? I wish I knew how to make it work. I'm trying to learn how to make CC from scratch just to fix this. with this pandemic I've got more time on my hands, you know? My sim here is Inuk (Inuit) living in a tiny house she built herself up in Northern Canada <3 I was inspired to make her after I met a stunningly beautiful woman the at a party the night before the lockdown. She was Inuit and I had never seen a face quite like hers before.

Thank you so very much! Hope you're all safe and cozy during the quarantine lockdown!