I'm struggling to open car....

I got me Scalectrix black Merc CLK DTM Ltd . I will be running it solely on wood and need to add some weight. The problem now is that after I've removed the screws, I can only get the body about an inch away from the chassis . The wiring to the lights seems to be too short. Do I have to remove the whole circuitry and replace it when I get the body back on or do I cut the wires and fit longer ones? Any ideas.