The chrome looks good on the bumpers, put masking tape on them to protect them before working your bondo. A bit of bondo wont hurt and you wont remember it's there anyway. The sills/rockers can be fixed easily but remember that material is very heavy and ordinary common panel steel is often too thin for patching. i cut good bits out of damaged cars for the sections to repair them. It's a major job to remove them entirely and not necessary normally.