maybe I dont want her to drive it........I wouldn't recommend a Weber for your sister, too many compromises to make.
A Weber will make it impossible, or difficult at best, to get both an air cleaner and a speedo cable on. You will probably need to trim the speedo opening in the fire wall to fit an air cleaner. A Weber will also make plenty of induction noise and you made find that the car will also get the smell of petrol inside. Look out for a pair of SU's from an MG Midget or a Cooper S, much better option in my opinion.
seriously though it will be more than likely be getting twin 1 1/4 SU's like you said, the weber can come later, once the novelty of the mini wears off an its left for me to play with
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