*edit*
Found Sarsmi's post that describes how to do this.
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Malas is actually in the negative z axis coordinates, don't ask me how I know this as I can't say, just take my word for it.
I never did test out if that makes a difference in how high you can go with goza floors - someone else I think tested and found out you can get as high as 120 or so (that would be like using the int dec tool 120 times to get something to go up).
Basically each floor in a regular house is 20 high. You can raise about 15. I think to match ceiling level you need three small wooden tables and three large doom book stacks. You also need spare goza mats to make an 'elevator'. Basically think of it like this - you can keep stacking items on top of each other all the way as far as they would go, but your arms are only so long right? So you need something to stand on top of so you can reach up there to stack more tables (or items or whatever).
What you would do is stack three tables on top of each other. On the floor in front to the east or south you would put down 2 square goza side by side. Raise one 2 times and the other 4 times, a little mini stair case. Walk up to the higher one and raise the lower one 4 times. This way you can keep raising yourself up higher. Anyways you really just need to do it the one initial time to get you 4 off the ground.
This allows you to stack the 3 damaged book piles on top of the 3 tables and then you can place the square goza on top of those. This goza mat is now ceiling height. Remove the damaged book pile that is second from the top (the middle one in other words) the remove all the other stuff. Now you'll have to step off the mini staircase to reach the bottom table to remove it (your arms are too short to reach down there, remember? )
The best place to start building a new ceiling/floor is the northwest corner, because circle trans does not affect goza mats so they would block your sight if you started from another corner. You can work your way across in rows or columns. Also beware that goza mats do cause lag. Unfortunately, or each of my houses would probably have five additional floors. Castles cannot have a full goza floor because their grassy areas are not ever enclosed by real floor, so the z axis space above them can't ever have gozas placed on it. However this is just what I know, if there is a way to bypass this somehow I would be greatly interested in finding out how.
Keeps can have full floors tho like I said even with a keep the lag is crazy. It's fun to have for a while but then when you have to do stuff around the house and you are stutter stepping everywhere it is a huge pain in the booty, so you might want to keep that in mind for houses that you use a lot.
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-Skylark