Hi Greg,
Nice looking scope and it looks like you have used some nice components.
There is nothing wrong with using the banding as a spider. It may not look pretty but that design is widely used and is very strong. On the other hand a wire spider will give you less diffraction. Have a look at the photos at the bottom of the page here:
http://www.pbase.com/rolfolsen/10_in...tube_newtonian
Rolf (Skyviking) has a thread in this section about his telescope which is worth reading.
I have built 3 wire spiders and like them a lot. They are not hard to construct - you just need to make a jig to hold it together while you thread the wires. You do need a stiff upper cage, otherwise the tension on the wires will make it go out of round. You should be able to use the astrosystems hub OK if you built a design like this (scroll half way down the page):
http://www.loptics.com/ATM/telescope...10in_F8p8.html
The strength of a wire spider is determined by the angle between the wires - 20 degrees is OK for a 12 inch.
The concern I have about your scope is the position of the secondary you have chosen. If I were to build a tall upper cage like yours, I would locate the secondary lower down to improve baffling. As it is, you will need to add a baffle to the top end to stop stray light entering the focuser. I might be misunderstanding your layout though.
I have tried curved spiders. I must have built them poorly because I saw more diffraction with them than with a conventional spider. Others whose opinions I repect love them so it can obviously be done.
Hope that helps,
Rod.