Lovely gun builder. Although I might be tempted to so something about that yellow line spacer! Haha.
If you are tempted, I have a set of 5 laurel 25.5" original barrels that date to about 1919. Beautiful condition. They are a bit narrow to fit my grade 6 but may fit yours. The costs involved will primarily be in having the barrels fitted to your specific gun, rather than the acquisition cost of the barrels. If you are interested PM me with the width across the breech face. Wingshooter16 can speak to this in more detail as he has had several barrels fitted to his Ideal 16's.