When converting the Mega Bloks ships, you will want to cut out certain plastic parts of the original ship from time to time, simply because they are in the way of your plans. You can use a crafting knife to cut out small or delicate parts, but it takes ages slicing into the plastic one tiny fraction at a time. When I have to take out bigger parts, I use these branch or rose cutters, which greatly enhance your hand's strenght and allow you to cut through the plastic with some effort. Be careful though not to hurt yourself and not to damage the ship. These cutters do not let you cut away a piece with precision, so undercut slightly and finish off the details with your knife. Do consider carefully what you want to do with your ship before you start work on it. It might actually be a very good idea to cut a part out. It will allow you to craft more easily and create a more playable surface in the end.
You have done a ton of work in your Mega Blok ship conversions, have you posted these pictures some where else also?