Design a childrens bed - wood

I want to build a multi-layer bed, and have a pretty good idea (in my head). I've attached three pictures of similar beds that I like the layout of.

My constraints:
* 235cm ceiling height
* 280cm width of room (aka rear wall width)
* on left side, 180cm depth before there is a radiator

I want to fit a 80x190cm mattress on top, parallel to the rear wall, with a staircase+slide on the right. Underneath, I want a 70x140 mattress, with railings for a small toddler. This should be at 90-degrees to the top mattress (so sticks out next to the stairs/slide). Stairs should have drawers accessible from the front. Behind the drawers, for the higher steps, there should be storage space accessible from underneath.

The left side, under the bed, should have a small wardrobe/storage space.

Top bed should have a wooden railing (20cm higher than the mattress, 20cm mattress thickness). No need for the round porthole window found in the images.

Platform should be 140cm high (so with mattress 160cm, leaving 75cm to the ceiling).

LED lights should be tactically positioned to make the space usable to read/study (both top bed and space underneath)

Deliverables:
* render of the bed
* parts listing (i.e. what pieces/sizes of wood I need to build this - e.g. 4 pcs : 80x80 beams for the vertical beams, 2pcs 45x145mm beams for the horizontal beams, etc
* exploded diagram of the parts / bed