The cowl should polish with autosol and I've even used the finest grade (0000) wire wool with polish then followed up with mutton cloth & polish on chrome on a Harley which was left to the elements.
It all depends on the depth of scratches you're dealing with of course.
Sounds like a bonnet re-paint for the paintwork.
I have to agree the straps are a bad fit and chafe the paintwork - I'm even considering fitting clear rub tape under the strap edges but as for looks.
Under normal road use vibration, the strap moves fore and aft & the bonnet twists as the chassis flexes.
