Curvature added to the end to match ripe up to the profile of 13 gage tank tunnel that Fab Kevin hooked me up with. It will make sense when it is all mocked up and ready to be welded together. 
Inside view, added R0.063 fillets to the interior corners for added strength. These will be welded into the bottom of the gas tank and sharp interior corners are a huge no no as it creates huge stress risers. Added a R0.125 to the top edge for a smooth look when in the gas tanks. Round corners are also less like to pop paint off. Same steel here, 1018, low carbon mild steel. 
Gas tank mount pockets. Design these from scratch to match up with the tabs and grommets and tank so that the bottom of the gas tank will be even with the bottom of the top tube on the frame. Gives a smooth line of the frame and bodywork in the end. As a result of this i had to machine some pretty deep pockets. The thru hole and .020" deep pocket are for a threaded bung that i will weld on later. Decided to make them 2 part rather than dropping some coin on 2.5" thick steel just to machine it mostly away.
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