You can use almost any common diode for D2 (like LL4148, M2, S1A etc). It’s just for reverse polarity protection. Although the package size is SOD123, it fits most small SMD diodes, like SMA, MiniMelf, or you can simply solder a through-hole diode there too).
The 2×6 male/female pin headers are the most common 0.1″ pitch dual row male/female header. If you have a 2×40 or any thing that’s larger than 2×6, you can cut/clip it to 2×6.
Thaks for the spreadsheet, its very usfull, after buying 2 units of 1.4 and making one 1.4, I am going to build some 3.1’s I have bought one which is great to compare parts, most parts I have obtained from http://www.aliexpress.com.
Have you made your one yet? did you have any problems?