That's an interesting question, Karlis. My guess is that the 34ft Benford Dory will quite probably come out with the top number of home build junk rigged boats. However, that number will be less than the number of professionally built boats, simply because for quite a long period, Newbridge Boats were making a range from the 19ft Navigator to the 26ft Pioneer, all with the option of junk rig (at least 31 in our members' boats directory). You didn't have to do it yourself, you could buy your junk rigged boat straight off the boat show stand, and that has resulted in a fair-sized fleet of junk rigged yachts up to 26ft, mostly still located in the UK. Similarly, there were the three sizes of Kingfisher yachts with junk rig offered as a factory-fitted option (19 in our members' boats directory).
A further thought – Tom Colvin's Gazelle design was very popular at one time, and I think I've seen as many of those, in various places, as I've seen of the Benford dories.