We the Fedora Respins-SIG are happy to announce new F26-20170815 Updated Lives. (with Kernel 4.12.5-300).
This will be the First Set of updated isos for Fedora 26.
With this release we include F26-MD-20170815 which is a Multi-Desktop iso in support of Fosscon (FOSSCON is a Free and Open Source software conference held annually in Philadelphia PA. )
With F26 we are still using Livemedia-creator to build the updated lives.
To build your own please look at https://fedoraproject.org/wiki/Livemedia-creator-_How_to_create_and_use_a_Live_CD
With this new build of F26 Updated Lives will save you about 600 M of updates after install.
Jbwillia's Weblog 
Thank you for your effort. It is much appreciated.
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was the MD ISO was a one-off? or has it been renamed source?
the mutlidesktop is only done for events (and by special requests )