Oohhh, that one will be fun. I hope you have some documentation or some experience. The new Honda's have amps/subs and the older ones didn't. Shouldn't be impossible however I think that you are going to find out that you will need to convert the 2008's low level inputs into RCA connectors and install at least a 4 channel amp to run the mid's and highs.

While I applaud the determination for a one-off, I have to ask, did you do this due to price or just a challenge? Keep us posted as you go either way. Pics also...