We have built several sets of gaff sails over the past four years. There are some tricks to getting them right. Getting a quote should not be that tough. Measure all fours sides of the sail. For estimating purposes you can estimate the peak and throat angles. Tanbark is salty looking but in reality any dyed cloth will cost more and have a shorter life than regular white Dacron. The reason for this is the cloth must be of a looser weave to accept the dyes and there are some differences in the manufacturing process.
Where are you located? In some parts of the country you can still find sailmakers that are adept with traditional rigs like yours.
Older wooden boats can require a tremendous amount of work and money. Although they are often cheaper than a fiberglass boat of similar size unless you can do all of your own work you may find it a lot less expensive in the long run to go with fiberglass.
IslandPlanetSails (dot) com
Thanks for the reply. I am in Port Huron, Michigan (eastern Michigan). I don't know of any lofts in Michigan, perhaps you do.
As for the costs, I am currently trying to get a rough calculation. I am very well connected with knowledgeable sailors and carpenters and have a full shop designed to cater to a 154 wooden schooner at my disposal, so I have a lot of help there. My intention is to hopefully make up for some of that money with extra labor as much as possible. If i can get the boat into serviceable and safe condition, then i can slowly start fixing her up more and more over the years, ie buy one new sail at a time, upgrade electronics, arrange the interior to my liking, new rigging, new engine, etc. As long as i keep my steady job, i have no costs except for food and smokes (trying to fix the latter) and the other occasional things that come up. with any luck i can turn her into a fairly nice boat in a few years