Thanks NetherStorm, hansmex, bdfd for your suggestions...
I've decided I will use a separate window and grill
Custom made steel/iron and folding door constructions
Folding door will use steel wire mesh instead of glass, so air circulations is guaranteed
I'm using light (wood) color instead of black to directs eyes not to the inside of building but to the window/door itself
What do you think?
Cheers!
