Roof build detailing OO

This large mixed pack has lots of bits, that, I do not know what they are.

So the bits, I do know, include;

8 Silver gutters 75mm long and 4 downpipes 50mm long with a large crank, 

The second silver sprue has an assortment of smaller gutters and downpipes used on the roof around dormer windows. 

The brown sprues have an assortment of Dormer windows and small roof windows.

Also included are 6 clear roof lights 24 x 14mm

The red sprues have more roof detailing.

HO for OO 1:87 scale