rear suspension chassis plates

[doop]

i have fully welded cp1,3,4,5,6 & 7 along with shock mounts and welded it to the frame work and have just noticed that itsnt stitting horrizontal and leaning downwards, i have also built the whole rear section of the car aswell. the question is will i be able to heat it up and move it upwards or do i have to cut it off the chassis and re do the chassis plate section again?