re: Anyone here an Electrician? General electrical/wiring experience?

Note: I am not an electrician. 

Personally, I didn't bother to run a power cord through the axle of my flip top cart.  I unplug it when it is not in use anyway and just coil the cord up.  Really not that big of a deal.  Just get yourself a really heavy duty extension cord and plug it in when you want to use it.  If you want an onboard outlet, you could make your own as Spintergroup recommends and use a 20 amp receptacle to insure that it can handle the extra strain that the 735 with Shelix might put on it.   You can cut the receptacle end off of a heavy duty extension (10/3) cord and wire that into the surface mounted box.  Of course it would be better if you have a 20 amp circuit you can plug it into. 

Note that I have used this retractable cord for years with my 735 without problems, including after upgrading with a Shelix.  I've never noticed the cord heating up during use and it has never tripped its built in breaker.  I have had other tools trip the breaker, though it turned out it had problems.  Of course it was much cheaper when I bought it about 10 years ago.