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If you know absolutely that you only need/want Qt 5 for Sigil and nothing else; you can whittle Sigil's entire footprint down to 115-120Mb (maybe less but I'm cautious). Judicious use of ldd/lddtree and the LD_LIBRARY_PATH/QT_DEBUG_PLUGINS environment variables can help you identify what Qt components Sigil needs to function.
I'm tempted to say you may have problems if you wanted to redistribute such a thing, but in fact, a LiveCD/DVD would make it a lot easier to do just that. Older incompatible hardware would probably be the only thing that might break it.
The problem that you're running into is that Qt is intended to be truly shared on a Linux system--by all apps that are based on it. Install it once on a system and then the apps can be easily redistributed in small, easily managed packages.
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