Per you suggestion I have decided to give it ago and construct my own case, I went through my wood pile and found a very nice straight 3/4" x 11' walnut trim. It's It has a routed profile on one side and it's 2 1/4" on the flat and 2 7/16" wide total. I have all the tools but since I have not used them for quite some time I'm going to draw it out and get started cutting and fitting some pine I have.A few thoughts in response. My own opinions:
I always consider the archival qualities of any material I put into a model. I follow the Specifications for Construction of Exhibition Models of U.S. Naval Vessels issued by the U.S. Navy's Sea Systems Command, Curator of Models: https://www.navsea.navy.mil/Home/Wa...ications-for-Building-Exhibition-Ship-Models/ These specifications are the "state of the art" for fine ship models. Most serious modelers follow them as much as possible and most museums and serious collectors demand them. Some deviation is possible but modern synthetic materials, particularly adhesives and coatings, should be avoided not simply because they may not meet the threshold hundred-year archival requirement, but also because the Navy standards produce a model which, if and when maintenance or restoration is required, will be amenable to disassembly for repair as needed with minimal impact to the rest of the model. For this reason, I would not use anything other than shellac on rigging cordage.
Like most modelers working for over fifty years in the game now, I once considered waxing rigging cordage to be mandatory. I no longer do. Bees wax is quite acidic for one thing, and for another, it seems to attract and hold dust like a magnet does iron filings. Microcrystaline "museum wax" is ph neutral but still poses the dust problem and is more difficult to apply to the cordage than bee's wax. The modern synthetic and synthetic/natural blend thread at this point seems sufficiently archival and doesn't present the problem of "fuzz" that natural threads often do. Linen thread, once the standard, is no longer readily available and, for modeling purposes, relatively extinct. I now defer to the opinion of the conservators at a number of major museums who are specifying Gutermann Mara polyester thread for rigging cordage. There are different grades of this stuff for the professional and the home sewing markets. Spools of the quantities and the colors one needs for laying up their own scale cordage can be ordered online from Wawak tailoring supply house: https://www.blog.wawak.com/post/gutermann-mara-thread-color-chart
Based on my own experience, which is to say my assessment may be biased by my own lack of skill, I would not consider an acrylic or polycarbonate case for a ship model. I have found getting a perfect joint glued to construct a plastic case to be near impossible unless one is a trained professional with the shop equipment to get the job done right. Acrylic and polycarbonate sheet is a rather expensive material as well and some of it isn't scratch proof. Plastics will outgas to some degree and outgassing can create an environment in a case which will promote degradation of the model. While admittedly a matter of personal taste, I've never thought an unframed case benefits the aesthetics of a model's presentation. I feel this is particularly true with period ship models. There's just something "solid and traditional" about a wooden framed display case.
Again, it's just my own personal opinion, but I've always found built cases to be outrageously overpriced for what they are. I suppose the high prices are an indication of what the market will bear, more than anything else, and the challenges posed by shipping the finished product, of course. Anyone who can build a ship model, or even assemble a ship model kit, ought to have no problem building a case for it. In terms of tools, all that is required is a table saw, a means of precisely cutting forty-five-degree angles and a means of clamping the mitered joints for assembly. The glazing for a case is easily held in a groove cut in the frame pieces with the table saw. If one doesn't have a table saw, it should be easy enough to find a friend who does or a local junior college manual arts class shop where a table saw can be accessed. The building of a case couldn't be simpler in terms of woodworking skills. There must be any number of practicums online for case building. It's simple enough that one doesn't even need plans and can just "wing it" freehand, although a few measurement notes never hurt!On the other hand, there's nothing preventing building a case that does credit to the fine custom furniture maker's art.