Astromech Leg Rocketpacks

These Astromech Rocket Packs fit on the leg of a Star Wars Astromech Droid - like R2D2. They are inspired by the ones R2 uses in the films. But unlike those, these remain visible on the legs at all times. The design allows for them to pop out for flight, then collapse back against the leg. If you have a droid, these will fully replace the "booster covers" typically used on a droid leg. They have a spring-loaded latch that holds them in the up position. And a simple latch to lower them again.

Some hardware you might consider if making these.

4) 15mm long 8-32 button head screws
2) 1/4" long 6-32 flathead screws
A piece of 2mm diamter brass rod
McMaster Carr part number 9065K81 302 Stainless Steel Spring.