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Old 07-30-2018, 04:14 PM
crystallographic crystallographic is offline
MetalShaper of the Month October '14 , April '16, July 2020, Jan 2023
 
Join Date: Dec 2010
Location: Western Sierra Nevadas, Badger Hill, CA
Posts: 4,388
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Looks to me like a piece that is applied to the car by threaded fasteners.


I'd make the bottom (base) piece fit the lid, with 1/2" flanges fore and aft and add the threaded inserts to it and the mount holes in the lid.
Then I'd make the ends with 3/8 - 1/2" flanges and solder them onto the base, using the base flanges.
Then I'd make the aft section and fit that onto the base and ends. Then take a line off the upper section, to the curve that looks right. I'd make a copper tube section that fits both the upper radius and the arch/curve, and trim the aft section to match that line, plus 3/16" for a radius bend - to embrace the tube. Solder the tube on where it is embraced by the aft section.


Make the front piece, now that experience has taught you well.

Fit that onto the base flange, the end flanges, and the top tube.
Cleco or sm screw w/#4 scruz. Solder on.

Use wet rag as heat sink to avoid melting previous seam.
Use 50/50 solder and common flux from the hdw store.


Caveat: Not to use TIG or MIG to apply solder.

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