You need an explosive to get rid of the silver pieces. Bounty hunters can throw thermal detonators with Z. I don't ever recall having to destroy the Gonk droids, but something I often miss is the pieces you Force to spell LEGO. If you don't stick around there for another second after you finish, you won't get all of the studs.
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i just finally gave up u dont get the coins so wat is the point so u may get 100%but wat does 100%do after u get it nothing so forget it and just waste money on characters like i do so i dont worry about the percent unless it give u someone new that i have never heard of like a new person never seen or even heard of
Gonk Droids: I think you require force pull Thermal Detonator: Press Z as a Bounty Hunter Silver Things on Wheels: Thermal Detonator or Self Destruct powerup with a droid Your Characters: Buy either Zam Wessel, Jango Fett, Greedo, Bossk, Boba Fett, IG-88, Dengar, or 4-LOM (buy all of the latter 6 to unlock Bounty Hunter Missions You don't destroy the vehicles. You build the Wookie Flyer, ride the Orange Car around for studs, build the Green Tractor, and ride the Tataun (the horned thing) around for studs.
Blaster Enhancements aren't required
In all, you have to leave and come back, losing all of your progress, unless you have the self destruct powerup