Hi Mike, one thing to keep in mind is that MoI is a 32-bit program, so it will max out at something like around 3.6 GB of memory usage, not when all your full 64-bit system memory is exhaused.

So to monitor MoI for running out of memory, if you're on a high memory 64-bit OS you'll really need to monitor MoI.exe in the process list and not just your overall system memory consumption. If you're on a 32-bit OS or on 64-bit with more like 4GB of memory then you could watch overall system memory.

When you have a particularly high level of geometry like you're doing here you will probably need to pay some extra attention to some things like this which you don't need to worry about so much with a more regular kind of model.

You also may get some better results for high complexity models if you reduce the display mesh density to be coarser - that can help to reduce memory consumption by quite a bit.

Some details for that in this previous post:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4196.2

The settings for that are under Options > View > Meshing parameters - try setting "Mesh angle" to 25 degrees and uncheck "Add detail to inflections". That may reduce memory load a fair amount.

- Michael