It is an excellant harness for the cost. It's similar to what I started with (& still use), along with my collar and hames harness(s).
Now, I'm upgrading. With the amish company I deal with, I can have the conways removed and sewn in buckles put on. The cost goes up!
You have them leave off the 1/2 noseband (styled after a full size draft horse, work bridle - attaches at the buckle that is attaching to the bit) and either get a cavesson w/ a "hanger" (like a huntstyle english brildle) or run a single strap thru the open area of the bit attachment. Think the cost will remain about the same.
If you think you will be doing any breed showing - have the headstall made so that you can get a side check later. Then either purchase it w/o the any checks at all or with the side check now.
I think they use snaps automatically on all their "entry level" harness. Not sure why... For me - I'm having several new sets of lines made - w/ sewn in buckles and no snaps. However, I do like snaps - makes it soooo much easier when working thru out the day with many horses. Mine came with snaps that fit thru the rein terrets on the pleasure harness and the rein rings on a work harness (on the hames) are much, much larger...
Also - double check the headstall. One way to save costs is using rivets. Again, I opted to have mine sewn and that raised my price. Suddenly you don't have that $175 harness! BUT you do have one that is affordably priced, and very usable though still an entry level harness.
I think when I matched some brass harness that I have - the cost for brass was a little more than stainless steel. Stainless steel is stronger and easier to care for (for me). Your color scheme sounds FANTASTIC!! Pretty.
Look at getting a brown harness. It won't be the "chestnut" color, nor the "lite" that is so popular w/ the QH (riding) folk, but it will be brown. Russet leather harness darkens over time - with oiling and with sweat. Did see someone had on another post that there is a product that conditions the russet w/o darkening it - and it protects it from most sweat color changes too... For that matter - your amish harness maker may have access to the different shades of beta.
BTW - the Camptown, the Comfy fit and the Country Carriages beta/bio thane harness(s) are all Amish made (though think thru different Amish communities/suppliers). It's all that extra attention to "little" details that makes those harness (s) commensurately more expensive than the other Amish made harness that I consider "entry level" type harness...
Please let us know how you do and what you decide on. Pictures, of course, are a "must"...
One other thing. My amish company I deal alot with (Fairview Country sales, Millersburg, OH) uses small pony harness to fit the larger mini's. The lines for a "mini" harness are too short for my horses - especially since I do a lot of ground driving, too. Other things might be sized different as well. The nice thing - I can get custom orders, as it sounds like your are going to do!!