I like the horizontal dropouts for the adjustable wheel base with a load and for the ability to make a single speed if you wreck your derailleur in the middle of nowhere. The low mount disc keeps rack mounting easy though I assure you fabricating and brazing that custom disc mount and compound bend chainstay is anything but.
The rack bosses are 6mm and are drilled clear through the stays and brazed on both sides for maximum thread contact.
I look forward to the evolution of this bicycle. The first rides were great and this one is sure to see many miles. Thanks for reading....
"......hungry like the wolf....."