The key word there is cheap... you dont want manual... the doors are not light... plus they will leak.... and just hope that the hinges dont break on you... Just spend the money and get a good kit...
There are some really nice lambo door kits out there... but, they're all on lambos.
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Redfire 2005 V6 5-speed auto. 10 psi after-cooled Vortech tuned by FAST Specialties, JBA headers and duals with custom H-pipe, GT rear bumper, Motive 3.73 gears, Auburn limited slip differential, CHE upper and lower control arms, American Racing Casino chrome wheels, Pirelli P-zero Nero 235/55/17 tires, chrome license plate frames (um... is that a mod?). Best 1/4 mile: 13.383 @ 102.84 MPH