Bad Piggies 2-I Perfect Win: Alien Parts

The perfect win is a term that I made up. It means beating the level with all three stars in a single attempt. On some levels it is impossible while for others it only seems impossible. It isn't useful in a casual playthrough but my hope is that for speedruns (particularly 100% speedruns) the strategies will be useful. I try to prioritize using vanilla parts but if I have to, I consider the next best thing is pulling it off using the 1-3 star parts. The tier below that is using any alien parts to beat the level.
Unfortunately this level seems to require alien parts.
Credit to ‪@fatefindsaway6834‬ for the strategy and design which I tweaked slightly because it wasn’t working for me.

[@fatefindsaway6834]

Levels left:Alien 2-20 and 2-32 and Alienless 2-15 and 2-18.

[@p00rguy9]

I am puzzled how you did those last two. Was 2-15 really tedious?

[@fatefindsaway6834]

@@p00rguy9 For me 2-18 went from impossible to slightly possible to doable and to really easy when I understood that I don't have to build an insane contraption to get the box. But just have to put the hook at an angle under the wheels to get the box. Because it's so close it does the job wireless.
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2-15 is an interesting story and it's pretty insane what you can do with just a plunger. Put the plunger between the wood and pig on top.
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Than spam the plunger to move.
When you get to the starbox hill spam the button with 2 fingers so it has less of a chance to get stuck on the pig and just push.
When you get the star just activate the plunger,it'll start breaking the gravity around itself and let go when it's facing the opposite side.
Then just push the pig to the finish line.

[@p00rguy9]

Wow 2-18 was so easy.

[@user-ir7ib9qu9s]

I get the skull in 2-26🙃

[@fatefindsaway6834]

@@user-ir7ib9qu9s So?