Hey, I was messing around with the game files, originally trying to just outright remove aircraft because they're broken atm but ended up trying to create a whole new vessel instead.
Now I am not an expert on the 688 and 688(i) by any means, and this is a pretty straight forward "Copy - Paste -Edit" mod using the base 688 so don't expect it to be perfect, but for just messing around it should do fine.
I'm also not an expert on the actual sensors on the 688(i), so I used some quick googling to try and get some sort of idea of what it would actually be carrying. If the sensors I've added are off, feel free to correct me.
You can download from here:
https://mega.nz/#!gmxmwDRQ!5UvXYyV0s...1NAcMvO4fszMjk
Subsim download:
http://www.subsim.com/radioroom/down...o=file&id=5230
Have fun!
Edit: Here are some pictures from In-Game.
http://imgur.com/a/zVnQ5