The Queensland squad has elected to take advantage of a lengthened mid-season break following the cancellation of the Kuala Lumpur round to complete the build.
The chassis will replace Whincup's current car that was debuted at last year's Sandown 500.
“We have decided to shift it up a gear and get the chassis ready earlier,” Team manager Mark Dutton told Speedcafe.com.
“As KL is no longer happening we have decided to do this otherwise we would have debuted it at Sandown.
“It (the new chassis build) was always dependent on how we were going on track and we haven't been tearing up cars.
“Things have gone well so we are taking up the opportunity.”