Outstanding work, Ed! It makes me wish I had a system that could run FSX
well, as opposed to just running it!
I wasn't aware that Sketchup had a function that could clean up the scenery object, but it makes sense since GMAX has something similar if I'm not mistaken. For GMAX I think it's "smoothing", but I may be mistaken.
Another option (though VERY time consuming) would be to make Levels of Detail (LOD's) for the objects. I can't remember if FSX handles them the same way as CFS2/FS9 did, but it may be an option.
Also, if you use one texture sheet per object as opposed to several sheets for one object, then it will reduce the "drawcalls" for the sim as well. You can do all the drawcall stuff with MCX. It won't be the same as if you did it prior to applying the textures to the object in Sketchup, but at least it will lower the need for computer power since the system will be calling up one or two textures as opposed to a dozen.
Since FSX can handle up to 2048x2048, you can have a better option of reducing the number of textures than you would when using the MCX function for FS9 since that one only goes up to 1024x1024. By using 2048 you can "stuff" more textures as pieces onto a single sheet - almost 4x as many.
If you model the LOD's individually in Sketchup, you can then add them one by one in MCX using it's LOD editor.
You also have an option to use the "auto" function MCX has and have it do it for you. In that case you just run the models you have through the MCX function and won't have to make the LOD's yourself, but you'll sometimes get some strange looking shapes as a result - especially with the lower LOD's.
It's definitely a wonderful project, Ed. Let me know if some of the tricks I've learned recently can help. They're meant for FS9, but FSX shouldn't be too far off. I'd be more than happy to share!
Jorge
Miami, FL