The previous photo is a good example. But is yours to be fitted to a "ship" or something smaller?
I only ask as the example shown seems to have a slightly smaller diameter than a ship unit. Also, all the units I've seen have had the belt drive cover set vertically upwards from the centre with the drive motor positioned above the window.
Simple enought to make though. Two plasticard "washers" (generally the units were painted white) glued either side ov the window, a small centre hole for the disc "axle, no need to cut the actual disc as the edge rim is hidden by the outer casings. The visible part of the disc between 12 and 15", with the casing part about 2" wide. And that's it. BY.
