Looks good,now just ditch those fender flares!
I don't know what size plastic you are looking for, but I was at Ace Hardware this weekend and they had some pretty heavy duty signs for cheap. I'd say they were at least 3/16" thick plastic, some as large as 18"x24".
Are you correcting the speedo for the smaller tires?
I kinda went thru the same thing with my old S-10. Started stock, then ~1.5 inch lift with 235-75-15 tires on HEAVY steel wheels. Then it got a makeover and dropped 2" lower than stock with stock aluminum wheels and 245-60-15's, and put an airdam back on it. Acceleration at low speeds improved very noticably just from reducing the wheel weight. Mileage went up from 27ish to around 30 mpg. And I quit beating it up trying to off-road it.
