keep in mind that my plan has single external walls and all the inside and outside walls are 10cm thick to make drawing easier and the depth of the verandahs includes the eaves, adding a brick veneer would use more space and given the choice it would be lovely to plan for a covered walkway and raked ceilings in the living areas and this is a very basic gable roof but there are lots of more exciting/expensive roof options to consider

1.4 x 1.4 is pretty pokey , and no , I suspect an 820 door will be too wide unless you swing it outwards , which is just weird . If it swings inwards , even if it at 90 degrees to the toilet itself , there will be almost no room for a person , a WC and the door 'swing' . Most doors are at the end of the room , the WC at the other end , and that will make it even worse -- if the WC protrudes 50cm from the wall , and your door is 820 , you have 8cm in which to stand ! Setting the WC 'offcentre , the door off-centre the other way gives a bit more space , but add a basin and you have an obstacle course to negotiate . Is there any way you can take the length to around 1.8-2 metres ? A width of 1.2 works , 1.4 might sound better , but with only 1.4 of length you are pretty much stuffed . .

You have an ensuite and an identical bathroom around 3 steps further apart. Can't see any advantage for this. You could lose the ens, relocate the WIR and end up with a bigger bedroom, bigger WIR and save money. Your roof has these eaves all close together over what appears to be some upper level windows, but these walls aren't reflected below. If I've understood this correctly you've added significant build cost for little gain. I think the room sizes are ok but I would suggest a design professional to polish it up.

you want the pegs above the head of the largest person sitting on the bench so they don't hurt themselves. They also need to be high enough for your longest coat. Test it out.