For all the people with large number of chips, the most feasible option would be a double density board with 20 Chips at about 100eur.
Even larger boards would pose problems that I don't want to face, doing such a time-constrained project.
This would be awesome, for 100 chips I'd much rather deal with 5 units then 10, and it would probably be much faster for you to assemble and test.
Thanks Burnin.
There are pros and cons for both sides. It is harder to manage many boards, but that gives better option if one chip gets bad on the board. Think about it. Of course, if the layout if fault tolerant, then there are no issues at all with larger board.