I have a 1985 Beneteau First 375 and I am looking for a replacement hatch for the companionway. This hatch is made of acrylic and is approximately 30” x 40” x 16mm. This is the overhead hatch that slides fore and aft to open or close. It has a slight crown (arc). The local suppliers can make one but the material in the correct thickness and tint is not available and they are asking for too much $. Suggestions please.