Great photos, Lance. Keep going, many are watching with interest. SOme thoughts:
- 45-degree angles are better for flow speed. Think "laminar".
- Intake diameter should mimic your carb diameter for a few reasons: 1. optimizes the carb's atomization at lower throttle, 2. minimizes reflected pulses that slow down airflow, and 3. makes jetting easier at all throttle settings. Given that, it's probably OK to have your intake 1-2 mm larger than your carb with all the bends you are doing. Long intakes start creating a "tuned intake" effect, where a reflected pulse from the open end of the intake increases pressure as the piston ports close; as much as 10% if you get about 30" of intake, but only over a very narrow rpm range.
- Watch out for soldering, it could re-melt at engine temps. How about using JB-weld? Brazing is probably OK, but your cups are too deep with standard Home Depot copper pipe. I know I can't braze that good...