The range has some great stuff. Hobbycraft and the range and screwfix are my go to places for terrain bits.
Dolls house?? Looks like a bombed out noble house to me!
Plastic radiator pipe?? Looks like toxic sump outlet!
Looks good. The use of straws is great; those things are soooo useful!
Making it on a slant looks complicated. Most of the boards I've done are flat, with a piece of scenery stuck to it; like a gun battery or other GW terrain.
Are you painting this up as well?