First, I wouldn't be doing this if I hadn't already done the math and understood the feasibility. Second, this is a competition – and as such, I have not (at least to this point) been interested in discussing my plans (nor “putting the numbers out there”) publicly. The 70% for guidance and control (after the launcher and propellant has been deducted) represents a realistic estimate (no, it's not “silly” by any means). Radio transmission from the satellite is not a major concern feasibility wise, but my example regarding space junk was in reference to avoiding orbital decay via upper atmospheric drag in very low insertions – and that is a concern; note that your comments here demonstrate a lack of understanding in this domain.
