Hey,
Maybe this has been proposed before, but i was wondering if it would possible to scale down the size of trees, rocks, buildings, cities, npc's, grass, plants, everything to say half its size, which would make the size of cyrodiil world-space seem twice as big? This method to increase the size of the world would (i think) solve the problem of long loading times, unstability etc that arise when the size of cyrodiil world-space is increased by scaling it up. And i dont think there would be much compatibility issues with mods either. What do you think? Can it be done?

Well there was a project once to increase the size of cyrodiil 4x but it also increased everything 4x - chairs buildings, etc.

Here is an idea - why not focus on modding the heightmaps which are all done and empty. that would increase the space by about 4 times what is currently available and no need to resize anything.

Quite the opposite. A half-sized mesh (visually) is exactly the same size in bytes - load times would not be changed at all. Smaller objects hide less behind them, so rendering your view is more complex, and so slower. Stability would not be affected, as that has very little to do with visual aspects of the game. Crashes usually happen because of logic problems in scripts etc.

I think you misunderstood my post,
Many people have already enlarged the size of the cyrodil world-space by scaling it up 2 times or 4 times, but that most of the time resulted in long loading times, unstability. So by scaling everything except the world-space down by half, it would achieve the same results but without these problems.

Yeah, i would prefer people working on the already created excellent heightmaps as well. In fact i am about to start work on a temporary mod that adds trees, rocks, grass, plants to the heightmaps.
But the main issue with current size of the cyrodill world-space is not that its too small, but that its too cramped. I mean travelling from one city to another takes only max 4 min (RL), there are no grassy-plains or large fields, its just forests and mountains.

There is no simple way to increase the size of Cyrodiil. No matter how you try to do it, it will end up being a never-ending nightmare. It wouldn't help stability either, in fact the opposite would be true. You'd need twice the amount of objects to cover the same areas, so performance would drop significantly. I don't even want to start to list all the problems that would occur if you downscaled all objects, not to mention the HUGE amount of workload it would involve. So no, this is not an option.

You will find alot of your answers has to reason why it really can't be done in this thread..

http://www.gamesas.com/index.php?/topic/775175-cyrodiil-scaled-x-2/