Renovating with autistic DS in mind

[Dazedandconfused28]

We have bought a 70's bungalow in need of a lot of work. We have space to extend into the loft & we are planning a kitchen extension.

I want to plan any works to best accommodate the needs of our autistic DS who is 4.

He is a capable climber, and constantly opening the fridge/ freezer, drawers etc.
He constantly climbs out of windows (we are replacing these with lockable triple glazed), he climbs up our towel rail in the bathroom & will sit astride the glass shower partition etc - I can't turn my back for more than 10 seconds. We have secured the garden, and all gates have external locks - but I want him to be safe in the house.

He has an indoor & outdoor trampoline, climbing frame, swing - but prefers to do things he's not allowed to!

My initial thoughts are that we should have as much inbuilt storage as possible to minimise furniture toppling on him, towel rails should be above climbing height etc - but has anyone else got any good suggestions or thoughts?

Just the usual, like fixing all furniture to the walls, especially TVs, wardrobes and bookcases. Buying a bungalow is very sensible! We have a 5 story house with a central staircase with a low balustrade above a 15 meter drop. I am terrified of having children over for playdates in case someone decides to climb onto the ballustrade. I hate these old movies like Mary Poppins where they show children sliding down bannisters.

At least one lockable kitchen cupboard and possibly locks on some rooms e.g. your bedroom so that you have somewhere you don't have to keep child safe?

Just a thought, do you need a towel rail? Even if high up, he’ll grow and maybe still fancy a climb. Good chance he could pull it off the wall.
Is providing more indoor safe activities an option? could you get some of those wall climbing colourful plastic things for the wall, would he climb horizontally along a wall? Also a mid or high sleeper bed that he can climb up into might distract him from climbing into other things.
my DD has ASD and loves hiding up high in her bed, it’s a little safe haven for her when things get too much.