Hi,
 here is a statistics I made about taking Squeak 3.10 and merging Cuis with
it on the Morph hierarchy, just to have an idea on how much it could take...

Number of Classes removed in Cuis: 265
Number of Classes added on 3.10: 0
Number of Classes added on Cuis: 5
Number of Classes to merge: 59
    Number of same methods: 930
    Number of changed methods on Cuis: 117
    Number of new methods on Cuis: 66
    Number of conflicting methods: 44  (method on 3.7 is different that the
one in 3.10 that in Cuis)
    Number of changed methods on current: 109 (from 3.7)
    Number of removed methods on Cuis: 796
    Number of new methods in current: 2192

Hope it is useful!
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