To be able to switch between all instruments quickly will require equipping other ports with rotators and guiders. This will not be cheap. During this shutdown, there were a number of upgrades made to the TCC software, and the echelle was recollimated. The final payment will be sent once they send the final report. Jon Davis and Dave Woods are in transit back to APO with the mirror, and the final report from Steward.
Preliminary design is in place.
The most radical feature is that the top of the top-end structure is open. This allows more room for instrumentation. Ed will be going down to APO to talk to people there next month about specific issues. We know of deficiencies with the current topend, so doing everything over could allow us to ameliorate these problems, perhaps using some ideas from the SDSS telescope topend. This new topend should much improve the mechanical stability of the telescope, and give us new degrees of freedom to help with collimation.