Thats a nice project- I was going to build a stepper motor control for my machine, but yours looks better and cheaper-
Could that controller have been adapted to the front of the carriage with a shaft passing through to the original handle?
It looks like you could make a remote connection from the front with a couple of rod ends and another lever so you wouldn't have to reach across to engage it.
On that table extension, how do you plan to attach it and align the dovetails? how much did shoptask charge for the piece?