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The rear fenders had to be widened by 7 mm on each side, so they had to be separated from the body. I used a 0.5 mm drill to perforate the body and then separated it with the #11 blade.
A permanent stress was given by hand to ease holding the parts apart when glueing the extensions.
The fender was fixed apart with styrene spacers glued to the body with reinforced superglue. This is the underneath view.
And this is the outside view to give an idea of how the rear fenders will look. The gaps will be filled with styrene.
31 May 2001:

Prowler's rear tires were shaved inside to slip over Copperhead's wheels.

Copperhead's wheels also had to give their central rib away on a drill chuck as shown, to accept the tires.
As for the fronts, Viper tires were fitted on Copperhead's wheels, and both were shaved too, like the rear ones. Here you see the team of wheels ready. The left column has Viper front tyres and the right column has Prowler rear tyres.
The wheels' bores were enlarged to house Prowler's axle pins, and the rolling chassis was put on wheels for the first time, followed by the body put over the assembly to see the looks. The rear wheel hit the fender so the fender will be cut from the line drawn on the fender.
03 June 2001:
The gap created due to widening of the rear fenders was covered with styrene sheets.
The width of Viper front end and Pt fenders is not acceptable as shown in the left pic. So I widened the Pt fenders by heating the plastic and pushing it outwards from the inside. The result is in the right pic.
The gap in the chassis was also filled with scratchbuilt styrene parts.
I modified the Prowler chassis with tubular sections ( upper picture ) and then went on covering the rear wheels, also preparing the internal side panels at the rear and the parting panel with the passenger compartment. ( lower picture )