Very interesting designs, taral. Unorthodox, compact and effective.
As for RockRaiderZulu's "Quadrants", by most standards of reactor building (better effectivity, less construction price) they are a failure. But may be they were built with something other in mind - like "how many diamonds can we fit into reactor hull?". Then they are quite good.
They were built with operating costs, stability, and effective lifespan in mind. If it is build cost that you are worried about, then looking elsewhere is advised. As of right now, they are the only purpose built hybrids that guaranty that more fuel is made than burned.