I used a topper on one of my cars and it looks decent. Good for most situations short of concours or OEM judging.
Rather than make restoration batteries, someone should make restoration cases already set up to install a compact racing battery inside. When the battery goes bad, all you’d have to do is replace the racing battery, not the whole expensive repro battery. Basically what many are doing now by hollowing out batteries that have gone bad, just sell the case so we’d be doing that from the get go.