The top and bottom domes MUST have the same shaped bases before attaching to the box frame representing the trench. As seen here, the bottom dome has a 5mm laminated styreen base with a 5mm framing and filler construction on top of it which is steeper than the bottom dome due to the Hanger Bay. This was required because the bottom dome's profile is slightly different from that of the top dome as viewed from front or aft. The side views are very different.
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