I would expect the R&D costs to dominate. One does not even need to consider economy of scale. For example, if the R&D is $1 million, and manufacturing one mi

I would expect the R&D costs to dominate. One does not even need to consider economy of scale. For example, if the R&D is $1 million, and manufacturing one mirror costs $100k, the total price for two mirrors is $1.2 million vs. $1.1 million for one. Plus, consider a non-zero probability of a launch failure.