Move Furnishings Windows Frames to Building Blocks

There is no need to have windows frames that are just building blocks in disguise in a special category. The only reason for a special category is their restriction to wood only and fixed depth - when windows can be made of materials beyond just wood and it should not be necessary to stack them to increase their depth. These are are useful building blocks for grates, stairs, railings.

I changed their material to black marble to fake iron railings using creative mode, for some odd reason iron is not an available texture. They make a clank marble sound not really metallic - but better than wood grain and wood sound.

That is the texture sub menu for building blocks, the window frame menu differs and shows window frames in different wooden texture options

But which texture in those metal ones looks like black wrought iron fence railing? Something that matches the sledgehammer head would be OK. Creative F8 edit texture allows you to go off base material so I picked black marble, has enough variation without being solid black - the bits of brown in it looks like rust.

I will try the block resizing trick as well is F8 edit resize - but since windowframes are artifically restricted from sizing depth not sure it will work.