I have just learned that the website from the University of Tokyo, which was inaccessible for quite a long time, has come back online: 
http://utlsktms.ioc.u-tokyo.ac.jp/

It is true that the implementation at present is entirely in Japanese, but even so it is pretty easy to navigate with a bit of common sense, I would think, and then one can see, freely, a large number of Skt MSS in the Tokyo University library.

Jonathan Silk

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J. Silk
Leiden University
Leiden University Institute for Area Studies, LIAS
Matthias de Vrieshof 3, Room 0.05b
2311 BZ Leiden
The Netherlands

copies of my publications may be found at