We want to buy an aft cabin, preferably a 405 or maybe a 355. My mechanic says not to because he can not get the 7.4 motors anymore and the only way to get them out to rebuild/replace is to remove the entire fly bridge and cut a whole in the cabin roof. I'm not sure about what he is saying, I have never heard of this. Has anyone had to go thru this? I would like to really like to hear about your experiences. Thank you in advance.