Need help on adding ships to sw3!

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Ok, I have follow the instruction on how to modify ships such as butcher and it's really work, but when I add new ships such as Excalibur_pl1 in carcasses, and I do modified the FloodTradeStations and InitTradeSystem to make it sell in market, but nothing happen, so can someone help me with following questions?Thanks a lot!

1, if I want add a minor modified version of exist ship and make it sell in market, do I only need to modify carcaess, InitTradeSystem, and FloodTradeStations?

2,if I want to add guns and equipment slots, am I also need to modify the imd file to add slot id ,the interface file to make it equipable, please make a list on which file I need to change, and how, thank you!