Same with me i just finishing the ME3 demo , it's funny how they use the same theme song out of ME2 for the Alliance Normandy in ME3.
If you feel like building some re-inforcement for it, by all means have at it!However i've built models on this scale before and from my experience it all depends on your methods and materials. Thickness of cardstock, type of glue used and such. However i'm not opposed to suggestions, however I will admit i'm not good enough with 3d modeling yet to create new structurs to an interal existing structure.
Also a good point. Something that i have done, which kinda sounds odd, but there is that foam stuff you can buy to fill wholes in the side of your house and such. It expands like crazy and i've found on larger models, it works very well to fill internal structures. It provides all around support and keeps the model light in weight and with less points of stress.
Sorry MAC guys, haven't had the time or processing power to spare to conver this to PDF yet. Will be a little while before i can get to it. However if someone wants to do this on their own, I have no quams with someone converting it to PDF