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Alex... this course of action is not advisable.
I would estimate that the secondary mirror required to get the focal plane out to a reasonable distance behind the primary would result in an obstruction ratio in excess of 60%.
Irrespective of how much money you threw at it, the result would be a compact 12" with the light grasp of a 10" and a really, really poor contrast transfer function.... and that's the best case scenario, if you're lucky.
For the cost of core drilling the primary, refiguring, coating the primary, buying a new secondary mirror, secondary holder & custom rear cell for the primary, you could pick up a used C11 and have change in your pocket.
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