It's cool you DIYed it. I did my own split mirror on my IIIC, adjusted the speeds using the CRT (highs from 1/60th) and using a digital camera on B mode at the back of the shutter (Lows under 1/60th, shell removed).
One thing I did not yet do on any Leica is the Curtains. I'de love to see tutorial on this.
Nice pictures. How hard is it to replace the mirror on a IIIc ? I've been thinking about it but I'm worried about finding suprises if I remove the wrong screw.