I've successfully made images where "du -hs" in the /root dir gave me 36MB.. I know this doesn't tell you how much is left, but it should give you an approximation of what's left. Also, at the very end of the output when you "build" it will say something like "main.img is too large".
Hope that helps,
RE:Midori: how to you know how much room you have left in an image (modified 0 times)
There's a message at the end of building the image like resize: oldsize: 13092864, newsize: 13172736
The second number is the full capacity of the most significant directories of the os. The first number is what you've used. This is a pretty good way of measuring where you are for space. I tried to fill up the last image, so you'll probably have to erase some stuff to get anything big in.
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