...have a great track record. I was thinking more of the big clusters used on current EELVs - they contribute to the current failure rate... my mistake.

Having said that why not real hybrids for the boosters like SpaceDev is planning to launch their orbiter design? The Centurion design is a good one even so, making the best use of existing and near-term equipment and designs. But it's just not going to happen unless there's a real commitment to building a massive facility on the Moon. The per unit cost won't go down until they're launching those big boys at ~ 5 - 10 units per year. At six astronauts per lander that's quite a manned presence on the Moon, or tons of equipment.

Cool idea even so.

Adam