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RaSCSI without ICs?

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No, I don't think so. The GPIO pins on the Raspberry PI are not spec'ed to be 5v tolerant so it's a pretty sure thing you'll smoke it without the buffers. (I dunno, maybe for the pins that are only inputs or outputs you could get by with some current-limiting resistors if the 3.3v output swing of from the Pi turns out to be enough to work the inputs on the SCSI bus side, but the bidirectional data pins realistically need to have some voltage shifting buffers in front of them.)

The buffers aren't exactly an exotic part, you should be able to buy them.

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