I only have doubts about the cutouts in the structure for the lifeboats. it can be done, but takes additional strenthening on the points where the superstructure reaches the hull, which might result in problems in the arrangement underneath it. as you seem to have only personnel decks underneath, I do not think it will be that much of an problem though.
Can't see that being any sort of problem at all, if you look at most current designs they all have the same or similar design for the life boat positions. AEGIR for a prime example.
@ LUET_est. I would be great full if you would let me use some aspects of your drawing and make it look a bit British for a small AU I'm trying to work out. One again I commend an excellent drawing.