A large portion of the design and machining work in this build went into the chainstay-bottom bracket yoke. These steel parts allow for chainring and crank clearance and a large rear tire without the need for a complex bend or dimpled tubes. My yoke is loosely based on the paragon machine works yoke, but specific to my bike geometry. 

There are two symmetrical halves of the yoke which are hollowed out on the inside to reduce weight. The halves are then fusion welded together (no filler) to create a smooth outer surface.  

I ended up tacking the slices while holding the tubes with zipties, mainly because I realized once welded the V-Block screw clamps would be stuck on the frame (oops). Zipties also gave me better clearance to weld. Since I was only tacking, no ziptie melting occured.

I wanted the front rack to be removable in case it ever got bent or I needed a custom rack for specialty cargo. To do this, I designed weld-on rack mounts that create a flat surface on the 1.5in tube on the front of the bike.

I experimented with some engravings on these parts for fun. I was unsure how they would look after powder coat, but they're still visible. Check out the glam pics! Ultimately these engravings are covered by the front rack, so they're just little easter eggs for myself.

All front triangle tubes tacked in place

Starting to really look like a bike!

First build up! Note the many parts borrowed off of other bikes including brakes, rear tire, and front wheel. The rear hub is internally shifting, so I get the beauty of a single speed chainline plus 8 gears of shifting (even when stopped!).

Back from powder! Color is Illusion Sour Apple.

Built up and in the wild!