My new layout design.

[capeklr]

I now file the window openings slightly bigger than the window and make
a window frame from 2.5 x 2.5 polystyrene angle profiles. 
These are glued to the outside wall as seen in this photo.

[capeklr]

From the inside.

[capeklr]

The window then fits very nicely inside the wall and rests against the window frame.
Photos from inside and outside.
Lots of work still ahead for me.

[BigEd]

Looking good!

[capeklr]

Hi all,

a bit of progress on the roundhouse.
I've now glued the first two wall sections together as seen in the first photo.
Second photo shows the next wall section being glued.
 

[BigEd]

Nice to see progress... I need to make a start on my layout...

[capeklr]

Hi all,

a bit of progress to report on the roundhouse before I get some more items next
week for the Steam loco project. 
I want the doors on the roundhouse to be functional, so I've been playing with different
ideas in my head for a while now.
I'm busy with the first one.
As it's getting more and more difficult to get the brass profiles that I want, I decided to have
a try with old rail.
First door taking shape.

[capeklr]

Now to make a hinge, small brass tubing and rod.
First ideas in this photo.

[capeklr]

With some very careful soldering I managed to get the hinge to work.
Door frame still needs to be completed, it must also be made slightly
narrower as I could only guess the size till I had the hinge working.
I plan to have a rod going through the baseboard and then to operate
the doors via servo's.
 

[BigEd]

I take it's old brass rails? Great idea as those are not popular to use and can be better used this way. Awesome idea!