Well, it's finally done. (Aside from the new body I'm working on)
This morning I made a few mods so I could mount the original servo plate on the opposite side in order to maintain the mechanical brakes.
Here's the finished product:
I've given it a little romp around the neighborhood and I love it. The low speed control on this Tekin ESC is impressive. I can only compare it to my 1/10 and 1/18 non-sensored stuff but it's way ahead of those in terms of 'feel'.
As far as the motor spacing goes it seems to be a manufacturing defect on the 3mm spacing. Tekin haven't answered my e-mail or posted in the thread I've created about the issue. I only know of one other user who has seen this issue, Jhautz. It's not a problem for me anymore since I just bored out the brake spacer for 4mm screws.