I do not understand. If you need IDE, why don't you just use the IDE from your mobo instead of messing with the catweasel? Besides, with the catweasel connected to IDE, you can't use IDE splitter anymore.
About the clockport connection, double check the cable pin 1. I have not used mine since i dismantled my A1200 tower, but i think multidisk.device has to be loaded from the harddrive because the catweasel has no ROM and is not bootable (unless you have a device called Kywalda or something like that).