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We used the Invision hack from bbpixel for a while, and he did an excellent job of setting it up for Xoops.
One problem you will have, is when you upgrade Xoops, you will also have to upgrade the Invision hack also. He's pretty fast on getting the patches out for XOOPS upgrades. To me it was always a pain to upgrade the hack, and I always feared really screwing up my data base.