Four years now and still in their packaging, I don't think I'll be building that scope after all. Moving on to new hobbies now.
New in box, removed only for these pictures, items are in new condition as I received them from Protostar. Original manual included. Much better images available via email on request.
1) Diagonal flat Pyrex secondary mirror, 2.6" minor axis. Sorry, no certification came with it
2) Adjustable diagonal mirror holder and spider, Promount series, for 2.6" minor axis diag mirror (see above) and 16" ID tube. Perfect flat black finish.
Asking price is $150, plus whatever it costs for your preferred means of shipping. I'll ensure excellent packing.
Thanks for looking.
-- Dan --