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From what I can glean from running your figures into Newt, an 50mm secondary and 1 1/4" focuser just doesn't work. The secondary misses some of the reflected rays from the primary and you wont get a fully illuminated field at the eyepiece focal plane . Basically throwing away the the light reflected from the primary to the secondary so that the light gathering to the eyepiece would be more akin to that from an 8" / 200mm mirror , or maybe less , a waste of the full 10" diameter mirror .
To get the full benefit of the 10" , you really need to bite the bullet and use a 2" focuser, low profile is better obviously, and at least an 62mm secondary mirror. Also how do you intend to be able to collimate the secondary mirror.
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