First of all, congrats on your "new bike". Please let me answer your specific questions:
Spindle Length: The spindle length is tied to the crank you choose, not the frame. Your Roadie has a 68mm wide bottom bracket with English (BSA) threading - most likely the same threading as your RX-100.
Most stuff should work:
> you need a 1 1/8" (28.6mm) front derailleur clamp.
> the head tube on your Gunnar is for a 1 1/8" steerer, while you have a 1" headset. Assuming you can and want to use the fork, there are shims you can buy that allow your 1" headset to fit into the head tube.
> Your Roadie is 130mm spacing. You might see if there's a way to add 2mm of spacers under the hub's lock nut.
An experienced mechanic will come in handy.
_________________ Richard Schwinn
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