[Stiglr]

Wow, that's an odd size.....

But still doable. In File > Settings.... enter these values into the box:

Draw grid major = 2.4384
Draw grid minor = 0.244

That should create the "visual cue" for you to model by. The visual prompts when you create shapes or use the measurement tools should still give you proper "metric" lengths.

But, check it by importing a model into FPSC. If it's "off" it should be by some order of 10 and then you can adjust your AC3D settings by "moving the decimal point" in your Draw grid settings.

For example, if the above measurements created objects 1/10 the size they ought to be, then change to:

Draw grid major = 24.384
Draw grid minor = 02.44