You can collect all of the minikits in the Hunk of Junk level by playing it in the Free Play mode. To unlock the Free Play mode of this level, first, you have to complete this level. Because to collect minikits you need different characters that have different abilities and you need those abilities to collect the minikits.
The first minikit that you’ll find is just beside a container on the left side of the ship. You need to switch to a scavenger character in order to get it. Use the Net Launcher on the X wall and climb it to collect the minikit.
There’ll be a terminal on the right side of the lift behind some boxes. Break the boxes and switch to a character to use the terminal. The terminal will open a secret storage room. There’ll be two boxes inside, just move these boxes back on the platform and you’ll get the minikit.
There’ll be a terminal on the left side of the lift as well. This terminal can be used only with stormtroopers so you need to switch to a trooper character. Use the terminal and it will open a secret storage room. There’ll be a droid inside it, ride on it and take it to the right side of the lift and there’ll be a switch just place the droid on the switch. You’ll get your minikit.
Now go up the lift and lower the sensing machine on the ship and then stormtroopers will come in through doors. The door on the front where you lower the crane has one minikit in it.
The last minikit will also be on the upper level, there’ll be a small door on the opposite side of the last door you collect minikit from. There’ll be some boxes in the room just break them and build the minikit and collect it.
Check our complete guide for Lego Star Wars: The Skywalker Saga here.