Well, for the last week or two (can't remember) I've been working on an in-scale mock-up of Jabba's Throne Room, made out of tag-board. This was a great way to work out the bugs, and get a feel for what exactly needed to be done. I made adjustments here and there, but tried as best as possible to get elements as close to actual scale as possible.
The biggest concerns for me scale-wise, was to make sure that the size of the arch over the throne, and the steps to either side of the throne were as close to the real thing as could be reasonably made based on photographs and floor plans, as I explained earlier. Not an easy task as most of the pictures feature cast/characters -- generally in the way. Even so, I still had to reduce the sizes of some things -- though I kept the height of the arch as close as possible. The stairs had to be reduced some, as did the width of the area where the design that goes around the archways is presented. In true scale, the arch graphic would be a width of 5", whereas I reduced it to 3.5". Anyway, building the mock-up was super-helpful, because it showed where my original floor plan had some design flaws, and by changing things up, I think I achieved a better design flow, and was able to add elements that weren't in my original plan (like the short arch with window next to the band).
Plus, I was able to turn Han in Carbonite sideways, like he is in the film -- though I reduced the space between him and the throne by a considerable amount. I have yet to work out the grate (in front of Jabba's throne) design -- it should be approximately 30" wide. Overall the floor space on this diorama works out to 89.75" wide and 33" deep (without the walls which will surround all but the front of the display -- and add an added 1/2" to width, and 1/4" to depth). Still need to figure out how I'm going to add lights to this monster display, and overall what materials I'm going to use for each element. Some of this diorama, due to length, will no doubt have to made out of wood just to support the roof (height of 24" maximum -- hence the reason the arches are incomplete in the center) -- where much of the lights and wiring are going to be hidden.