Thank you for the complement and bump. For those of us building on islands or mountains we don't have the luxury of flat lots. So this technique will help in these situations. I have added some real examples.
Some Examples from my world (Housenfluke Rest – final mid June)
I built this beach lot with a large bathroom on a sloping lot and placed stairs. Only Indiana Jones would have the courage to go up those stairs 8). So I broke up the stairs with two landings as shown in the second screen shot. Using the techniques above, I expanded the foundation and depressed part of it two levels, then depressed another portion two more levels, deleted unneeded tiles and added stairs and railings.
http://lvlt.thesims3.com/sims3_asset/sims3_asset/media/shard000//shard000/486/279/017/00/screenshot_original.jpg
http://lvlt.thesims3.com/sims3_asset/sims3_asset/media/shard000//shard000/485/279/017/00/screenshot_original.jpg
This house on a steep seaside lot had a seaside deck far below it. The only way to the deck was for Sims to run up and down the steep lot. I used these techniques to build a new deck with a connecting staircase.
http://lvlt.thesims3.com/sims3_asset/sims3_asset/media/shard000//shard000/481/279/017/00/screenshot_original.jpg
This house has a deck only one set of stairs below it. The deck is above the water by about 5 steps, so it could have been lowered more.
http://lvlt.thesims3.com/sims3_asset/sims3_asset/media/shard000//shard000/488/279/017/00/screenshot_original.jpg
This deck has been depressed by 3 sets of stairs and the original cement pilings of the foundation have been replaced by wood pilings under the deck.
http://lvlt.thesims3.com/sims3_asset/sims3_asset/media/shard000//shard000/483/279/017/00/screenshot_original.jpg
These lots as well as three mountainside lots are in my Housenfluke Rest update. I have finished all the landscaping, cured routing and tears and am ready for a week of test. I will release it some time around June 11 - 15.