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RussianSpaceWeb today has posted a good detailed update on the construction status of Vostochny.
The update suggests that the April 12 deadline is not firm. Things could be delayed beyond that date. The update also made no mention of the report that the Soyuz rocket assembly building had been built to the wrong size. This could either mean that the building was built correctly and the report was wrong, or that they are now trying to keep this fact from the press while they scramble to fix it.