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@DickBarton
Yes Johan you're absolutely correct, but I am obsessive about maintaining the condition of my bearings and cones and cups. The slots in the bottom bracket seem to be designed to catch any dirt/sand/grit/water thrown up by the front wheel so I personally wouldn't ride even for a weekend with an open BB. Taping up the holes will be a good temporary fix for the weekend. I would also recommend spraying the down tube, seat tube and chain stays if possible with some sort of frame saver or cavity wax or at a push, WD40 (though that won't last long) so that in the long term any rust won't form on the insides of the tubes and drop into the BB area.
Addie, I would probably go for an overlap and glue or tape to seal the joint as best as possible. A quick assembly of the BB out of the frame on the bench should enable you to get the side to side width just right.