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I'm certainly intrigued with your design of the placement of the focuser. Would like to see some drawings or sketches of your design to get a better picture of what you're trying to achieve.
From what I can picture the placement shortens the distance from the secondary to the focuser, which means the light cone will be narrower and you will not lose as much reflected light and the secondary will be further from the primary. Placing the focuser where you propose will mean extra obstruction of the incoming light to the primary though.
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