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Anin,
Most of your questions have been covered several times over the course of this thread. I know it is a long read, but it may help give you a better idea of the "how and why".
The standpipe setup has little to do with the overflow box itself. So yes, you can use an overflow box with less linear surface area. You lose a significant amount of surface skimming ability, increase noise due to the thicker sheet of water entering the box, etc... See any of the calfo overflow threads for more of an in depth discussion.
The standpipe setup will work, or can be adapted to, any size return pump. As described here, the setup will easily handle up to ~2000 GPH silently, with the bulk of the flow going through the single siphon standpipe.
Spend some time reading the thread and the article on my website, it is worth the time if you are insterested in using this setup.
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