Hi Harrison, I have a similar setup to you and Mike. 250mm f5 Skywatcher (but on an HEQ5 pro mount... overloaded on paper but not in practice). I originally started guiding with a finder guider but then went to the Orion thin oag. It took a bit of fiddling with thin spacers to get the guide camera to be at the same focus as the imaging camera, but after that its been plug and play. The thin oag is designed for DSLR's and has the same back space as a T mount.
Here's a pic of my 1100d, Orion thin oag, Baader coma corrector and ZWO 120mc guide cam.
Rick
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