After some kit bashing, cutting and glueing this is what I came up with so far. I have to work out a lot of the details and have to buy some parts for that. The front gun has to swivel, turn and shoot a missile. The top missile launcher has to really fire the missiles and also swivel (hopefully 180 degrees). I also have to figure out what to use as the side drills and side "eye rockets".
This is the rough layout. Now the real work begins.