Yes, that is ballpark value. As some pointed out, theses are listed sometimes $2000-3000. Don't know how many actually sell at that price.
I recently sold a few duplicates, some restored, some original. I didn't get anywhere near that price to make a sale.
You have an interesting carbine that can be put at a certain time and place. Should add historical interest value, however, somebody looking for a complete and original representative example would have to think about buying this one. More of an advanced collector interest.
Value is difficult guessing what somebody else would pay.
I find it interesting that you say that most of the rifles that you find are No.1 or No.4. I have found most of my carbine projects, including the two trials carbines, in Newfoundland.