I have a part built Billings Cutty Sark. Most of the hard work had been done, namely constructing the plank on frame hull. That has left only the masts and rigging to do. I bought it because it was remarkably cheap, about £40 IIRC. The main reason for its purchase was the scale, 1/75, so it should fit in with 00 scale nicely. If you check the scales used by Billing you will find several models in 1/75 scale.