All very true. The one thing to note is factory made hunting/sporting rifles of the time period were a little scarce and very expensive compared to average income. The old surplus rifles were very plentiful and were sometimes sold for only a few dollars. Sears and Roebuck stores and hardware stores had them loose in barrels and people could just dig whatever they wanted out.

Since people wanted a nice looking factory hunting rifle, it was natural to 'dress up' the old battle rifle. Many were crudely done but there were some that are actually works of art. (Unfortunately most are the former)