Acrostacking

Here's this awesome technique I've learnt from modthesims (original link: http://modthesims.info/t/361359) that's called "acrostacking".
I'll leave a small tutorial, pictures included.

Step 1:

Have an object whose height you can't change (you CAN drag up or down a wall most wall lights). In this example I'll be using these curtains which do not reach to the top part of the window.
Hit Ctrl+Shift+C and a cheat box will appear in the top of the screen. Type in "moveobjects on" and hit enter, then open the box again and type in "constrainfloorelevation false". These are NECESSARY for this technique.

Step 2:

Using the "raise terrain" tool, rise the terrain in the area you'd like to place the object. The item will stay still, will not move along the wall's movement. "How much" you should rise the terrin depends how much you want to rise the object.

Step 3:

Grab the objects with the hand tool and place it in the same place it was. It will now snap to the heightened terrain.

Step 4:

Level the terrain. The walls will adjust back, but the object will not come down.
Final result:

Note that if you displace the object, even if you pick it up and leave it in the same place it was, it will come down to its original height. You can still change styles, that will not affect the placement.
You should now disable moveobjects (moveobjects off) and enable constrainfloorelevation (constrainflooelevation true) to prevent game corruption.

Enjoy acrostacking!

Victorian mansion: Dining room is ready, garden on the way!

The dining room currently:

I had to acrostack the curtain's height for it to fit the window properly.
And the garden (which isn't finished yet):

Huge piece of work.

Victorian Mansion: Changes to the foyer's size, new bedroom in first floor and it's bathroom.

I decided to make a few adjustments to the foyer's size and distribution, here's how it is now:

Perhaps it's looking TOO white, but oh well. Living chairs are turned ~25 degrees using the Alt key. (see snapping objects to grid).
Bedroom (on first floor!):

Yes guys, this bedroom DOES look amazing. Had to "acrostack" the curtains on the window in the middle in the first picture to make them fit properly.
And here's the pétit bathroom of this room:

Any feedback is gratly appreciatted! :)