Right. From a collector's standpoint, I'm afraid this one is a bit of a lost cause. "Sporterizing" was common immediately after WWII, and indeed up until the 1960s, when these rifles began to be appreciated on their own merits for their design and history. Quality of the conversions ran the gamut from professional efforts to garage hack jobs with little modification other than shortening the original stock. In each case, though, the serial numbered parts not used got separated from the rifle and discarded or just lost over the years.
These guns are a hard sell today. Not throwing any rocks here; it's just the truth.
My best friend's father had a NRA surplused M1903A3 that he used to take a deer every season. It was a beautiful rifle, complete and original except that the stock had been neatly shortened just in front of the sling band. It was extremely accurate with its original iron sights. It eventually began to be worth some serious coin, as it could be easily restored. My friend sneaked that rifle out of his dad's closet one day and took it to a talented gunsmith for a complete conversion to a sporting configuration, including high gloss blue and replacing the bolt handle with a swept one like is seen above. The receiver got drilled for scope mounts. The rifle was now gorgeous. And ruined. Its character and history were both gone. I was there when the presentation was made. The owner was too much of a gentleman to say anything negative about it, but the rifle never went on another hunt.
Edit: Thousands of M1936 and M1954 Mexican Mausers were imported into the US after being sold off by the Mexican government, many in original new condition. They had a delightfully smooth small ring Mauser action, with a light, precise trigger release. Most of these rifles were used in high end sporting conversions. Nice originals are really rare today. Here's an unissued 1944 example that escaped. My notes say that it sold for $2,995 several years back:
