To all that replied, thank you!
I probably will not use T-moulding, perhaps use the router and shape it instead.\
The keywiz encoder is the new one, the one with the switch and screw-on terminals.
I bought the 3" trackball with a mounting kit.
As far as switching the joysticks from 4-8 way operation, I will build a restrictor plate to accomplish that. That way I can change it as the game requires it. I did not wanted to pay $35 ea for the ones that are switchable on the fly.
My friend, who is an electrical eng. will provide me with any wire I need. I just need to tell him which gauge and color.
As far as mounting hardware goes, I have a source I can just walk in a take what I need. (Ahh, the benefits of not burning any bridges. My old job!

I will try and post pictures of my progress when I actually get the parts and start building. In the meantime, any other suggestions?
TIA!