pic: Iron Lions WCD Gearbox

[asid61]

Looks really good! You might be able to gear higher, but it's preference really.
You can decrease the C-C disatnce of the gears by 0.002" if you wanted to. It only needs to be like +0.001" or apparently +0.000".
I really like the encoder placement.
I really like how you've incorporateed the first stage of gearing to offset the extra thickness added by using dog shifting.
Side plates can be 3/16" thick I think, but I'm not 100% sure if that's okay in thsi situation.