create a rectangle
select edit node
select both lateral nodes and drag them down
add 2 new nodes and move them to the side to get a roof
select the upper node and round it off
move the handle so that the tip is already rounded

create a rectangle on the side

for the window again a rectangle then click on edit node
and click on perfect symmetry

you can still adjust the handles but i like it quite well as it is 

select edit node again
add new nodes as in the first picture
drag them to the top
at the top select total symmetry again
adjust the handles so that one is straight and the other creates the arc 

select edit node again and drag the two corners left and right apart to give the tower its shape
then add lines 
these will help later when painting
adjust these to the edge of the tower

create 2 circles on top of each other
you can disable the look aspect ratio function for this
create a rectangle and drag it from the lower circle on the

create a rectangle with a width of 1mm
put it in place and select circle array
adjust the values and the copies
once this is created make a copy of it and mirror it for the other side

if not all parts came out well i pushed them out with such a thin fine knife

for painting I used acrylic pens
the help lines help here well as a guideline